WIP checkpoint: Client-side player controller: movement + camera

2026-08-20 20:26:27 +00:00
180 changed files with 199 additions and 17453 deletions
@@ -1,39 +0,0 @@
 name: checkpoint
 # Runs the full checkpoint suite (migrations, backend pytest, Godot smoke
 # tests, multiplayer, fresh-clone boot) on every push and PR.
 #
 # Runs on a `host`-label act_runner on the AGP box: Docker, ~/godot/godot,
 # and Python 3 are already there. Deliberately uses no JavaScript actions
 # (actions/checkout etc.) so the host needs no Node install -- checkout is a
 # plain git clone from the local Gitea. See docs/ci.md.
 on:
  push:
    branches: [main]
  pull_request:
 jobs:
  checkpoint:
    runs-on: host
    steps:
      - name: Checkout
        run: |
          set -eu
          rm -rf repo && mkdir repo && cd repo
          git init -q
          git remote add origin "http://x:${{ github.token }}@localhost:3000/${{ github.repository }}.git"
          git fetch -q --depth 1 origin "${{ github.sha }}"
          git checkout -q FETCH_HEAD
      - name: Python env
        working-directory: repo
        run: |
          set -eu
          python3 -m venv .venv
          .venv/bin/pip install --quiet --upgrade pip
          .venv/bin/pip install --quiet -r backend/requirements.txt
      - name: Checkpoint suite
        working-directory: repo
        run: .venv/bin/python scripts/run_checkpoint_tests.py --postgres-port 25690 --backend-port 18690
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 path="res://.godot/imported/right_hand_glove_01.glb-a59875b630ac413350c3bdf6acc84bdf.scn"
 [deps]
 source_file="res://assets/avatars/right_hand_glove_01.glb"
 dest_files=["res://.godot/imported/right_hand_glove_01.glb-a59875b630ac413350c3bdf6acc84bdf.scn"]
 [params]
 nodes/root_type=""
 nodes/root_name=""
 nodes/root_script=null
 nodes/apply_root_scale=true
 nodes/root_scale=1.0
 nodes/import_as_skeleton_bones=false
 nodes/use_name_suffixes=true
 nodes/use_node_type_suffixes=true
 meshes/ensure_tangents=true
 meshes/generate_lods=true
 meshes/create_shadow_meshes=true
 meshes/light_baking=1
 meshes/lightmap_texel_size=0.2
 meshes/force_disable_compression=false
 skins/use_named_skins=true
 animation/import=true
 animation/fps=30
 animation/trimming=false
 animation/remove_immutable_tracks=true
 animation/import_rest_as_RESET=false
 import_script/path=""
 materials/extract=0
 materials/extract_format=0
 materials/extract_path=""
 _subresources={}
 gltf/naming_version=2
 gltf/embedded_image_handling=1
@@ -1,40 +0,0 @@
 {
  "objects": {
    "crate_small": {
      "asset_id": "props/crate_small.glb",
      "type": "prop",
      "display_name": "Small Crate",
      "category": "props"
    },
    "rock_01": {
      "asset_id": "props/rock_01.glb",
      "type": "prop",
      "display_name": "Rock",
      "category": "nature"
    },
    "tree_pine_01": {
      "asset_id": "props/tree_pine_01.glb",
      "type": "prop",
      "display_name": "Pine Tree",
      "category": "nature"
    },
    "lamp_post_01": {
      "asset_id": "props/lamp_post_01.glb",
      "type": "prop",
      "display_name": "Lamp Post",
      "category": "props"
    },
    "chest_01": {
      "asset_id": "props/chest.glb",
      "type": "interactable",
      "display_name": "Treasure Chest",
      "category": "interactables"
    },
    "spawn_point": {
      "asset_id": "",
      "type": "spawn_point",
      "display_name": "Spawn Point",
      "category": "gameplay"
    }
  }
 }
@@ -1,17 +0,0 @@
 {
  "content_flags": {
    "violence": "none",
    "mature": false
  },
  "rules": [
    {
      "trigger": {"type": "on_interact"},
      "conditions": [],
      "actions": [
        {"verb": "give_item", "item_id": "gold_coin", "count": 3},
        {"verb": "play_sound", "sound_id": "chest_open"},
        {"verb": "rotate", "target": "self", "degrees": 90, "axis": "y", "duration": 0.4}
      ]
    }
  ]
 }
@@ -1,8 +0,0 @@
 {
  "templates": {
    "small_crate": {
      "asset_id": "props/crate_small.glb",
      "display_name": "Small Crate"
    }
  }
 }
@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import create_async_engine
 from app.config import settings
 from app.database import Base
-from app.models import user, session, world, asset, avatar_loadout, world_content  # noqa: F401
+from app.models import user, session, world, asset  # noqa: F401
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
@@ -1,39 +0,0 @@
 """add avatar_loadouts table
 Revision ID: 0004_add_avatar_loadouts_table
 Revises: 0003_add_refresh_tokens_table
 Create Date: 2026-09-05 00:00:00.000000
 """
 from typing import Sequence, Union
 from alembic import op
 import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
 # revision identifiers, used by Alembic.
 revision: str = "0004_add_avatar_loadouts_table"
 down_revision: Union[str, None] = "0003_add_refresh_tokens_table"
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
    """Create the avatar_loadouts table (one row per user)."""
    op.create_table(
        "avatar_loadouts",
        sa.Column(
            "user_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            primary_key=True,
        ),
        sa.Column("data", postgresql.JSONB(), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
    )
 def downgrade() -> None:
    """Drop the avatar_loadouts table."""
    op.drop_table("avatar_loadouts")
@@ -1,120 +0,0 @@
 """add world_rooms, world_chunks, world_chunk_revisions tables
 Revision ID: 0005_add_world_content_tables
 Revises: 0004_add_avatar_loadouts_table
 Create Date: 2026-09-14 00:00:00.000000
 See docs/architecture/world_persistence_impl.md §4. Chunk content
 (rooms, chunk payloads, chunk revisions) lives in Postgres, purely
 additive to the existing ``worlds`` table.
 """
 from typing import Sequence, Union
 from alembic import op
 import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
 # revision identifiers, used by Alembic.
 revision: str = "0005_add_world_content_tables"
 down_revision: Union[str, None] = "0004_add_avatar_loadouts_table"
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
    op.create_table(
        "world_rooms",
        sa.Column("id", sa.Integer(), primary_key=True, index=True),
        sa.Column(
            "world_id", sa.Integer(),
            sa.ForeignKey("worlds.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("slug", sa.String(64), nullable=False),
        sa.Column("name", sa.String(255), nullable=False),
        sa.Column(
            "grid", postgresql.JSONB(), nullable=False,
            server_default='{"size": [32, 32, 1], "origin": [0, 0, 0]}',
        ),
        sa.Column("bounds", postgresql.JSONB(), nullable=True),
        sa.Column("spawn", postgresql.JSONB(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column(
            "updated_at", sa.DateTime(timezone=True),
            server_default=sa.func.now(), nullable=False,
        ),
        sa.UniqueConstraint("world_id", "slug", name="uq_world_rooms_world_slug"),
    )
    op.create_index("ix_world_rooms_world_id", "world_rooms", ["world_id"])
    op.create_table(
        "world_chunks",
        sa.Column("id", sa.Integer(), primary_key=True, index=True),
        sa.Column(
            "world_id", sa.Integer(),
            sa.ForeignKey("worlds.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "room_id", sa.Integer(),
            sa.ForeignKey("world_rooms.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("chunk_key", sa.String(160), nullable=False, unique=True),
        sa.Column("cx", sa.Integer(), nullable=False),
        sa.Column("cy", sa.Integer(), nullable=False),
        sa.Column("cz", sa.Integer(), nullable=False, server_default="0"),
        sa.Column("format_version", sa.Integer(), nullable=False, server_default="1"),
        sa.Column("payload", sa.LargeBinary(), nullable=False),
        sa.Column("payload_len", sa.Integer(), nullable=False),
        sa.Column("checksum", sa.String(64), nullable=False),
        sa.Column("revision", sa.Integer(), nullable=False, server_default="1"),
        sa.Column("content_flags", postgresql.JSONB(), nullable=False, server_default="{}"),
        sa.Column("is_mature", sa.Boolean(), nullable=False, server_default="false"),
        sa.Column(
            "updated_by_id", sa.Integer(),
            sa.ForeignKey("users.id", ondelete="SET NULL"),
            nullable=True,
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column(
            "updated_at", sa.DateTime(timezone=True),
            server_default=sa.func.now(), nullable=False,
        ),
        sa.UniqueConstraint("room_id", "cx", "cy", "cz", name="uq_world_chunks_coord"),
    )
    op.create_index("ix_world_chunks_world_id", "world_chunks", ["world_id"])
    op.create_index("ix_world_chunks_room_id", "world_chunks", ["room_id"])
    op.create_index(
        "ix_world_chunks_room_coord", "world_chunks", ["room_id", "cx", "cy", "cz"],
    )
    op.create_index(
        "ix_world_chunks_mature", "world_chunks", ["world_id"],
        postgresql_where=sa.text("is_mature"),
    )
    op.create_table(
        "world_chunk_revisions",
        sa.Column("id", sa.Integer(), primary_key=True, index=True),
        sa.Column("chunk_key", sa.String(160), nullable=False),
        sa.Column("world_id", sa.Integer(), nullable=False),
        sa.Column("revision", sa.Integer(), nullable=False),
        sa.Column("action", sa.String(16), nullable=False),
        sa.Column(
            "actor_id", sa.Integer(),
            sa.ForeignKey("users.id", ondelete="SET NULL"),
            nullable=True,
        ),
        sa.Column("checksum", sa.String(64), nullable=False),
        sa.Column("payload", sa.LargeBinary(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
    )
    op.create_index("ix_world_chunk_revisions_chunk_key", "world_chunk_revisions", ["chunk_key"])
    op.create_index("ix_world_chunk_revisions_world_id", "world_chunk_revisions", ["world_id"])
    op.create_index("ix_world_chunk_revisions_created_at", "world_chunk_revisions", ["created_at"])
 def downgrade() -> None:
    op.drop_table("world_chunk_revisions")
    op.drop_table("world_chunks")
    op.drop_table("world_rooms")
@@ -1,33 +0,0 @@
 """add presence columns to users
 Revision ID: 0006_add_presence_columns
 Revises: 0005_add_world_content_tables
 Create Date: 2026-09-14 00:00:00.000000
 Ported forward from the orphaned agent/dd2a126b57a1 branch (originally
 2a9b9873244a_add_presence_columns.py, down_revision 0001_initial) and
 rebased onto the current migration head. See app/services/presence.py /
 app/routers/presence.py.
 """
 from typing import Sequence, Union
 from alembic import op
 import sqlalchemy as sa
 # revision identifiers, used by Alembic.
 revision: str = "0006_add_presence_columns"
 down_revision: Union[str, None] = "0005_add_world_content_tables"
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
    """Add last_seen_at and status_message columns to users table."""
    op.add_column("users", sa.Column("last_seen_at", sa.DateTime(timezone=True), nullable=True))
    op.add_column("users", sa.Column("status_message", sa.Text(), nullable=True))
 def downgrade() -> None:
    """Remove presence columns from users table."""
    op.drop_column("users", "status_message")
    op.drop_column("users", "last_seen_at")
@@ -1,118 +0,0 @@
 """add social graph tables (friendships, follows, blocks)
 Revision ID: 0007_add_social_graph_tables
 Revises: 0006_add_presence_columns
 Create Date: 2026-09-15 00:00:00.000000
 docs/planning/social.md US-1 / app/models/social.py. Models + migration
 only -- the request/accept/block business logic lives in the sibling
 "Friends & follow API router" task.
 """
 from typing import Sequence, Union
 from alembic import op
 import sqlalchemy as sa
 from sqlalchemy.dialects import postgresql
 # revision identifiers, used by Alembic.
 revision: str = "0007_add_social_graph_tables"
 down_revision: Union[str, None] = "0006_add_presence_columns"
 branch_labels: Union[str, Sequence[str], None] = None
 depends_on: Union[str, Sequence[str], None] = None
 def upgrade() -> None:
    friendship_status = postgresql.ENUM(
        "pending", "accepted", name="friendship_status"
    )
    friendship_status.create(op.get_bind(), checkfirst=True)
    op.create_table(
        "friendships",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column(
            "requester_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "addressee_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "status",
            postgresql.ENUM(
                "pending", "accepted", name="friendship_status", create_type=False
            ),
            nullable=False,
            server_default="pending",
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.UniqueConstraint("requester_id", "addressee_id", name="uq_friendships_pair"),
    )
    op.create_index("ix_friendships_requester_id", "friendships", ["requester_id"])
    op.create_index("ix_friendships_addressee_id", "friendships", ["addressee_id"])
    op.create_table(
        "follows",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column(
            "follower_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "followed_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.UniqueConstraint("follower_id", "followed_id", name="uq_follows_pair"),
    )
    op.create_index("ix_follows_follower_id", "follows", ["follower_id"])
    op.create_index("ix_follows_followed_id", "follows", ["followed_id"])
    op.create_table(
        "blocks",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column(
            "blocker_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column(
            "blocked_id",
            sa.Integer(),
            sa.ForeignKey("users.id", ondelete="CASCADE"),
            nullable=False,
        ),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.UniqueConstraint("blocker_id", "blocked_id", name="uq_blocks_pair"),
    )
    op.create_index("ix_blocks_blocker_id", "blocks", ["blocker_id"])
    op.create_index("ix_blocks_blocked_id", "blocks", ["blocked_id"])
 def downgrade() -> None:
    op.drop_index("ix_blocks_blocked_id", table_name="blocks")
    op.drop_index("ix_blocks_blocker_id", table_name="blocks")
    op.drop_table("blocks")
    op.drop_index("ix_follows_followed_id", table_name="follows")
    op.drop_index("ix_follows_follower_id", table_name="follows")
    op.drop_table("follows")
    op.drop_index("ix_friendships_addressee_id", table_name="friendships")
    op.drop_index("ix_friendships_requester_id", table_name="friendships")
    op.drop_table("friendships")
    postgresql.ENUM(name="friendship_status").drop(op.get_bind(), checkfirst=True)
@@ -75,52 +75,11 @@ class Settings(BaseSettings):
    # CORS
    CORS_ORIGINS: str = "http://localhost:8080,http://localhost:3000"
    # Per-IP auth rate limiting (app/rate_limit.py). Disabled by the
    # checkpoint smoke suite, which runs every test from one client IP.
    RATE_LIMIT_ENABLED: bool = True
    # File uploads
    UPLOAD_DIR: str = "uploads"
    MAX_UPLOAD_SIZE_MB: int = 100
    GLTF_MAX_FILE_SIZE_MB: int = 200
    # ── Game-server orchestration ──────────────────────────────────────────
    # The join flow (POST /api/worlds/{id}/join) ensures a headless Godot
    # dedicated-server process exists for a world and returns its address.
    # Disabled by default so nothing tries to spawn Godot in environments
    # that don't have it (plain pytest, CI without the engine); the
    # checkpoint/playtest launcher turns it on.
    GAME_SERVERS_ENABLED: bool = False
    # Path to the Godot 4 binary. "godot" resolves via PATH.
    GODOT_BIN: str = str(Path.home() / "godot" / "godot")
    # Godot project directory (the game repo root -- backend/ is a subdir).
    GAME_PROJECT_DIR: str = str(Path(__file__).resolve().parents[2])
    # The host clients should connect to for ENet. Defaults to the LAN IP the
    # launcher bakes into the exe; overridable for local testing.
    GAME_SERVER_HOST: str = "127.0.0.1"
    # Port range for per-world dedicated servers.
    GAME_SERVER_PORT_MIN: int = 27000
    GAME_SERVER_PORT_MAX: int = 27099
    # Kill a world's server this long after its last join with no active
    # players reported.
    GAME_SERVER_IDLE_TIMEOUT_SECONDS: int = 300
    # How long ensure_server() waits for a spawned server to report
    # "ready": true in its status file before giving up (503 to the
    # joining client). See world_persistence_impl.md §7.4 -- content
    # loading makes a slow start more likely than the old bare-port-bind
    # wait, so this is a separate, longer-by-default budget.
    GAME_SERVER_READY_TIMEOUT_SECONDS: float = 20.0
    # The base URL the dedicated Godot server should call back into this
    # backend on, for the read-only /api/internal content routes
    # (world_persistence_impl.md §4.4 / §7).
    GAME_SERVER_INTERNAL_API_URL: str = "http://127.0.0.1:8000"
    # ── World content persistence (world_persistence_impl.md §4.4) ─────────
    WORLD_CHUNK_MAX_PAYLOAD_BYTES: int = 1_048_576  # 1 MiB
    WORLD_CHUNK_MAX_OBJECTS: int = 512
    WORLD_CHUNK_MAX_BATCH: int = 64
    WORLD_CHUNK_REVISION_KEEP: int = 20
    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
@@ -6,18 +6,15 @@ from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from app.config import settings
-from app.routers import auth, users, worlds, assets, avatar, world_content, internal, presence
+from app.routers import auth, users, worlds, assets
 from app.services.game_servers import supervisor
@asynccontextmanager
 async def lifespan(app: FastAPI):
    """Application lifespan: startup and shutdown events."""
-    supervisor.start()
+    # Startup: initialize database, connect to Redis, etc.
    yield
-    await supervisor.shutdown()
+    # Shutdown: close connections, cleanup
 app = FastAPI(
@@ -40,11 +37,7 @@ app.add_middleware(
 app.include_router(auth.router, prefix="/api/auth", tags=["auth"])
 app.include_router(users.router, prefix="/api/users", tags=["users"])
 app.include_router(worlds.router, prefix="/api/worlds", tags=["worlds"])
 app.include_router(world_content.router, prefix="/api/worlds", tags=["world-content"])
 app.include_router(assets.router, prefix="/api/assets", tags=["assets"])
 app.include_router(avatar.router, prefix="/api/avatar", tags=["avatar"])
 app.include_router(internal.router, prefix="/api/internal", tags=["internal"])
 app.include_router(presence.router, prefix="/api/presence", tags=["presence"])
@app.get("/api/health")
@@ -2,12 +2,5 @@ from app.models.user import User
 from app.models.session import Session
 from app.models.world import World
 from app.models.asset import Asset
 from app.models.avatar_loadout import AvatarLoadout
 from app.models.world_content import WorldRoom, WorldChunk, WorldChunkRevision
 from app.models.social import Friendship, Follow, Block, FriendshipStatus
-__all__ = [
+__all__ = ["User", "Session", "World", "Asset"]
    "User", "Session", "World", "Asset", "AvatarLoadout",
    "WorldRoom", "WorldChunk", "WorldChunkRevision",
    "Friendship", "Follow", "Block", "FriendshipStatus",
 ]
@@ -1,41 +0,0 @@
 from sqlalchemy import Column, Integer, ForeignKey, DateTime
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
 # The default a brand-new account gets before they touch the customization
 # screen. Kept in sync with assets/avatars/catalog.json (the base_body id) and
 # with the client's AvatarLoadout.to_json() shape.
 DEFAULT_LOADOUT: dict = {
    "base_body": "base_human_male_01",
    "slots": {},
 }
 class AvatarLoadout(Base):
    """A user's equipped avatar composition.
    One row per user. The whole loadout is stored as a single JSON document
    matching the client's ``AvatarLoadout.to_json()`` shape
    (``{"base_body": str, "slots": {...}, "skin_tone"?: {...}}``) rather than
    exploded into columns -- the server has no copy of the asset catalog, so
    deep validation (does this asset exist, is it valid for this slot) stays
    on the client. The server only enforces the envelope: valid JSON object
    with a non-empty ``base_body``.
    """
    __tablename__ = "avatar_loadouts"
    user_id = Column(
        Integer,
        ForeignKey("users.id", ondelete="CASCADE"),
        primary_key=True,
    )
    data = Column(JSONB, nullable=False)
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)
    user = relationship("User", back_populates="avatar_loadout")
@@ -1,106 +0,0 @@
 """Social graph: friendships, follows, blocks.
 docs/planning/social.md §4/§5 (US-1). Friends = mutual (request -> accept),
 Follow = one-way (no approval), Block = hard deny. This module is models +
 schema only -- the request/accept/block business logic (idempotent
 duplicate/self handling, removing an existing friendship/follow on block,
 etc.) belongs to the API router task that depends on this one.
 """
 import enum
 from sqlalchemy import Column, Integer, ForeignKey, DateTime, UniqueConstraint
 from sqlalchemy.dialects.postgresql import ENUM
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
 class FriendshipStatus(str, enum.Enum):
    PENDING = "pending"
    ACCEPTED = "accepted"
 class Friendship(Base):
    """A friend request, directional until accepted.
    ``requester_id`` sent the request to ``addressee_id``. Once accepted the
    friendship is mutual, but the row stays directional (who asked whom) for
    audit purposes; the API layer treats it as symmetric once accepted.
    """
    __tablename__ = "friendships"
    id = Column(Integer, primary_key=True, index=True)
    requester_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    addressee_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    status = Column(
        ENUM(
            FriendshipStatus,
            name="friendship_status",
            create_type=False,
            values_callable=lambda enum_cls: [e.value for e in enum_cls],
        ),
        nullable=False,
        default=FriendshipStatus.PENDING,
        server_default=FriendshipStatus.PENDING.value,
    )
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)
    requester = relationship("User", foreign_keys=[requester_id], back_populates="sent_friend_requests")
    addressee = relationship("User", foreign_keys=[addressee_id], back_populates="received_friend_requests")
    __table_args__ = (
        UniqueConstraint("requester_id", "addressee_id", name="uq_friendships_pair"),
    )
 class Follow(Base):
    """A one-way follow relationship: ``follower_id`` follows ``followed_id``."""
    __tablename__ = "follows"
    id = Column(Integer, primary_key=True, index=True)
    follower_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    followed_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)
    follower = relationship("User", foreign_keys=[follower_id], back_populates="following")
    followed = relationship("User", foreign_keys=[followed_id], back_populates="followers")
    __table_args__ = (
        UniqueConstraint("follower_id", "followed_id", name="uq_follows_pair"),
    )
 class Block(Base):
    """A hard deny: ``blocker_id`` has blocked ``blocked_id``."""
    __tablename__ = "blocks"
    id = Column(Integer, primary_key=True, index=True)
    blocker_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    blocked_id = Column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)
    blocker = relationship("User", foreign_keys=[blocker_id], back_populates="blocks_initiated")
    blocked = relationship("User", foreign_keys=[blocked_id], back_populates="blocked_by")
    __table_args__ = (
        UniqueConstraint("blocker_id", "blocked_id", name="uq_blocks_pair"),
    )
@@ -1,7 +1,7 @@
 from datetime import date
 from typing import Optional
-from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date, Text
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Date
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
@@ -20,58 +20,10 @@ class User(Base):
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
    # Presence / status (backend/app/services/presence.py, app/routers/presence.py)
    last_seen_at = Column(DateTime(timezone=True), nullable=True)
    status_message = Column(Text, nullable=True)
    sessions = relationship("Session", back_populates="user", cascade="all, delete-orphan")
    refresh_tokens = relationship("RefreshToken", back_populates="user", cascade="all, delete-orphan")
    worlds = relationship("World", back_populates="owner")
    assets = relationship("Asset", back_populates="owner")
    avatar_loadout = relationship(
        "AvatarLoadout",
        back_populates="user",
        uselist=False,
        cascade="all, delete-orphan",
    )
    # Social graph (docs/planning/social.md US-1; app/models/social.py)
    sent_friend_requests = relationship(
        "Friendship",
        foreign_keys="Friendship.requester_id",
        back_populates="requester",
        cascade="all, delete-orphan",
    )
    received_friend_requests = relationship(
        "Friendship",
        foreign_keys="Friendship.addressee_id",
        back_populates="addressee",
        cascade="all, delete-orphan",
    )
    following = relationship(
        "Follow",
        foreign_keys="Follow.follower_id",
        back_populates="follower",
        cascade="all, delete-orphan",
    )
    followers = relationship(
        "Follow",
        foreign_keys="Follow.followed_id",
        back_populates="followed",
        cascade="all, delete-orphan",
    )
    blocks_initiated = relationship(
        "Block",
        foreign_keys="Block.blocker_id",
        back_populates="blocker",
        cascade="all, delete-orphan",
    )
    blocked_by = relationship(
        "Block",
        foreign_keys="Block.blocked_id",
        back_populates="blocked",
        cascade="all, delete-orphan",
    )
    @property
    def is_adult(self) -> bool:
@@ -34,6 +34,3 @@ class World(Base):
    owner = relationship("User", back_populates="worlds")
    assets = relationship("Asset", back_populates="world", cascade="all, delete-orphan")
    # world_content.py / world_persistence_impl.md §4.1. Added here (only)
    # so PC1/PC2 code depending on this module is otherwise untouched.
    rooms = relationship("WorldRoom", back_populates="world", cascade="all, delete-orphan")
@@ -1,153 +0,0 @@
 """World content persistence models.
 Implements the schema decided in ``docs/architecture/world_persistence_impl.md``
 §4: chunk content (rooms, chunk payloads, chunk revisions) lives in Postgres,
 alongside ``worlds``, rather than in a per-world SQLite file
 (``docs/architecture/world.md`` §4, superseded).
 The chunk *payload* format itself (the 48-byte header + sectioned binary
 body) is unchanged from ``world.md`` §3.6 and is decoded/encoded by
 ``app.services.chunk_codec``, not by these models -- these just store the
 opaque ``BYTEA``.
 Conventions follow the existing models (``app/models/world.py``,
 ``app/models/avatar_loadout.py``): declarative ``Column(...)`` style,
 ``Integer`` surrogate PKs, ``DateTime(timezone=True)`` with
 ``server_default=func.now()``, JSONB for document-shaped fields.
 """
 from sqlalchemy import (
    Boolean,
    Column,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    LargeBinary,
    String,
    UniqueConstraint,
    text,
 )
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 from app.database import Base
 # Default chunk grid, matching Chunk.CHUNK_SIZE_* in scripts/chunk.gd (the
 # client's source of truth for the same constants) and world.md §2.2.
 DEFAULT_ROOM_GRID: dict = {"size": [32, 32, 1], "origin": [0, 0, 0]}
 # The room every world gets automatically (world_persistence_impl.md §4.1).
 MAIN_ROOM_SLUG = "main"
 MAIN_ROOM_NAME = "Main"
 class WorldRoom(Base):
    """A bounded region within a world -- a level, building, or zone
    (world.md §2.1). Holds the chunk grid config so a world can later hold
    rooms with different grids without touching the ``worlds`` table.
    """
    __tablename__ = "world_rooms"
    id = Column(Integer, primary_key=True, index=True)
    world_id = Column(
        Integer, ForeignKey("worlds.id", ondelete="CASCADE"), nullable=False, index=True
    )
    slug = Column(String(64), nullable=False)  # url-safe; "main" by default
    name = Column(String(255), nullable=False)
    # {"size": [x, y, z], "origin": [x, y, z]}
    grid = Column(
        JSONB, nullable=False,
        server_default='{"size": [32, 32, 1], "origin": [0, 0, 0]}',
    )
    bounds = Column(JSONB, nullable=True)  # {"min":[x,y,z], "max":[x,y,z]}; null = unbounded
    spawn = Column(JSONB, nullable=True)  # {"pos":[x,y,z], "yaw": 0.0}
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
    )
    __table_args__ = (
        UniqueConstraint("world_id", "slug", name="uq_world_rooms_world_slug"),
    )
    world = relationship("World", back_populates="rooms")
    chunks = relationship("WorldChunk", back_populates="room", cascade="all, delete-orphan")
 class WorldChunk(Base):
    """One chunk's persisted content -- the atomic load/save/stream unit
    (world.md §2.1). ``payload`` is the world.md §3.6 binary blob, stored
    verbatim as BYTEA.
    Deltas from world.md §4.4 (SQLite design): a surrogate integer PK +
    unique coordinate constraint (rather than ``chunk_key`` as the PK), no
    ``dirty`` column (write-behind doesn't apply over Postgres -- see
    world_persistence_impl.md §3.3/§5), and content flags folded into this
    row as JSONB + an indexed ``is_mature`` boolean rather than a separate
    ``content_flags`` table (world.md §4.6).
    """
    __tablename__ = "world_chunks"
    id = Column(Integer, primary_key=True, index=True)
    world_id = Column(
        Integer, ForeignKey("worlds.id", ondelete="CASCADE"), nullable=False, index=True
    )  # denormalized: world-scoped queries without a join through rooms
    room_id = Column(
        Integer, ForeignKey("world_rooms.id", ondelete="CASCADE"), nullable=False, index=True
    )
    chunk_key = Column(String(160), nullable=False, unique=True)  # world.md §2.3 / §4.5
    cx = Column(Integer, nullable=False)
    cy = Column(Integer, nullable=False)
    cz = Column(Integer, nullable=False, server_default="0")
    format_version = Column(Integer, nullable=False, server_default="1")
    payload = Column(LargeBinary, nullable=False)  # world.md §3.6 bytes
    payload_len = Column(Integer, nullable=False)
    checksum = Column(String(64), nullable=False)  # SHA-256 hex of payload body
    revision = Column(Integer, nullable=False, server_default="1")
    content_flags = Column(JSONB, nullable=False, server_default="{}")  # world.md §3.4
    is_mature = Column(Boolean, nullable=False, server_default="false")
    updated_by_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
    )
    __table_args__ = (
        UniqueConstraint("room_id", "cx", "cy", "cz", name="uq_world_chunks_coord"),
        Index("ix_world_chunks_room_coord", "room_id", "cx", "cy", "cz"),
        Index("ix_world_chunks_mature", "world_id", postgresql_where=text("is_mature")),
    )
    room = relationship("WorldRoom", back_populates="chunks")
 class WorldChunkRevision(Base):
    """Audit trail of chunk writes (world.md §4.7). ``chunk_key``/``world_id``
    are deliberately **not** foreign keys, so deleting a chunk or a world
    preserves the audit trail.
    Retention (world_persistence_impl.md §4.3, required): only the newest
    ``settings.WORLD_CHUNK_REVISION_KEEP`` rows per ``chunk_key`` keep a
    non-null ``payload``; older rows are pruned (payload nulled, metadata
    row kept) by ``WorldStore`` in the same transaction as the write that
    triggers it.
    """
    __tablename__ = "world_chunk_revisions"
    id = Column(Integer, primary_key=True, index=True)
    chunk_key = Column(String(160), nullable=False, index=True)
    world_id = Column(Integer, nullable=False, index=True)
    revision = Column(Integer, nullable=False)
    action = Column(String(16), nullable=False)  # 'create' | 'update' | 'delete'
    actor_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    checksum = Column(String(64), nullable=False)
    payload = Column(LargeBinary, nullable=True)  # full payload at this revision; nulled by retention
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False, index=True)
@@ -1,73 +0,0 @@
 """Lightweight in-process rate limiting.
 The backend runs single-worker (required by the game-server supervisor), so a
 process-local sliding-window counter is sufficient and needs no Redis. Keyed
 by client IP. Used to blunt credential brute-force on the auth endpoints.
 If the backend is ever scaled to multiple workers/hosts this must move to a
 shared store (Redis) -- flagged here rather than silently under-enforcing.
 """
 from __future__ import annotations
 import time
 from collections import defaultdict, deque
 from fastapi import HTTPException, Request, status
 from app.config import settings
 class SlidingWindowLimiter:
    def __init__(self, max_hits: int, window_seconds: float) -> None:
        self.max_hits = max_hits
        self.window = window_seconds
        self._hits: dict[str, deque[float]] = defaultdict(deque)
    def check(self, key: str) -> None:
        now = time.monotonic()
        q = self._hits[key]
        cutoff = now - self.window
        while q and q[0] < cutoff:
            q.popleft()
        if len(q) >= self.max_hits:
            retry = max(1, int(q[0] + self.window - now))
            raise HTTPException(
                status_code=status.HTTP_429_TOO_MANY_REQUESTS,
                detail="Too many attempts. Try again shortly.",
                headers={"Retry-After": str(retry)},
            )
        q.append(now)
    def reset(self) -> None:
        self._hits.clear()
 def _client_key(request: Request) -> str:
    # X-Forwarded-For first hop when behind the reverse proxy, else the socket.
    fwd = request.headers.get("x-forwarded-for", "")
    if fwd:
        return fwd.split(",")[0].strip()
    return request.client.host if request.client else "unknown"
 # 10 auth attempts / minute / IP -- generous for a human, painful for a
 # brute-forcer.
 _auth_limiter = SlidingWindowLimiter(max_hits=10, window_seconds=60)
 async def auth_rate_limit(request: Request) -> None:
    """FastAPI dependency: rate-limit auth attempts per client IP.
    A no-op when ``RATE_LIMIT_ENABLED`` is false -- the checkpoint smoke
    suite runs every test against one backend from one client IP, so the
    per-IP cap would trip mid-suite. The dedicated ``test_rate_limit``
    module exercises the real behaviour regardless of this flag.
    """
    if not settings.RATE_LIMIT_ENABLED:
        return
    _auth_limiter.check(f"auth:{_client_key(request)}")
 def reset_all() -> None:
    """Test hook."""
    _auth_limiter.reset()
@@ -16,15 +16,11 @@ from app.database import get_db
 from app.dependencies import CurrentUser
 from app.models.session import RefreshToken
 from app.models.user import User
 from app.rate_limit import auth_rate_limit
 pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
 router = APIRouter()
 ## Minimum age to register. This platform is adults-only.
 MIN_AGE = 18
 # --- Pydantic schemas ---
@@ -43,19 +39,14 @@ class RegisterRequest(BaseModel):
    username: str
    email: EmailStr
    password: str
-    # Real date of birth -- the server computes age from it and rejects
+    over_18: bool  # Simple boolean confirmation instead of date_of_birth
    # anyone under MIN_AGE. Still self-attested (no document check yet), but
    # a concrete, stored, legally-meaningful data point rather than a
    # throwaway checkbox, and the seam for a future hard ID-verification
    # pass. See docs/architecture/content_moderation.md 5.2.
    date_of_birth: date
 class UserResponse(BaseModel):
    id: int
    username: str
    email: str
-    date_of_birth: date | None = None
+    date_of_birth: str | None = None
    is_active: bool
    created_at: datetime | None = None
@@ -117,9 +108,15 @@ def hash_password(password: str) -> str:
 def calculate_age(birth_date: date, today: date | None = None) -> int:
    """Calculate age in years from a birth date.
-    Used by /register (PC3 Phase 3) to compute age from the submitted
+    Not called by /register anymore (that endpoint now just trusts the
-    date_of_birth and enforce the 18+ gate. See
+    client's over_18 boolean, see RegisterRequest) -- kept as a real,
-    docs/architecture/content_moderation.md 5.2.
+    tested utility since date-of-birth storage/verification is coming
    back in a future pass (real age math, not just a client-side claim,
    the user explicitly wants to revisit this design). Removing it broke
    backend/tests/test_auth_age_gate.py's collection entirely (ImportError
    on `from app.routers.auth import calculate_age`) for zero benefit --
    restoring it is the lower-risk path over rewriting or deleting 17
    tests for logic this codebase will need again.
    Args:
        birth_date: The person's date of birth.
@@ -154,25 +151,16 @@ def _issue_refresh_token(user_id: int, db: AsyncSession) -> str:
 # --- Endpoints ---
-@router.post("/register", response_model=TokenResponse, status_code=status.HTTP_201_CREATED,
+@router.post("/register", response_model=TokenResponse, status_code=status.HTTP_201_CREATED)
             dependencies=[Depends(auth_rate_limit)])
 async def register(req: RegisterRequest, db: AsyncSession = Depends(get_db)):
    """Register a new user and return access + refresh tokens.
-    Requires a date of birth; the server computes age and rejects anyone
+    Requires over_18 boolean confirmation; rejects users who are not 18+.
    under MIN_AGE (18). See docs/architecture/content_moderation.md for the
    verification design and its self-attestation limitation.
    """
-    age = calculate_age(req.date_of_birth)
+    if not req.over_18:
    if age < 0 or req.date_of_birth > date.today():
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
-            detail="Invalid date of birth",
+            detail="Must be 18 or older to register",
        )
    if age < MIN_AGE:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail=f"You must be at least {MIN_AGE} to use this platform",
        )
    # Check if username already exists
@@ -195,7 +183,7 @@ async def register(req: RegisterRequest, db: AsyncSession = Depends(get_db)):
        username=req.username,
        email=req.email,
        hashed_password=hash_password(req.password),
-        date_of_birth=req.date_of_birth,
+        date_of_birth=None,  # No longer collecting DOB
    )
    db.add(user)
    await db.flush()  # flush to get user.id before creating refresh token
@@ -215,7 +203,7 @@ async def register(req: RegisterRequest, db: AsyncSession = Depends(get_db)):
    )
-@router.post("/login", response_model=TokenResponse, dependencies=[Depends(auth_rate_limit)])
+@router.post("/login", response_model=TokenResponse)
 async def login(form: OAuth2PasswordRequestForm = Depends(), db: AsyncSession = Depends(get_db)):
    """Authenticate user and return access + refresh tokens.
@@ -1,78 +0,0 @@
 """Avatar router - the current user's persisted avatar loadout.
 The loadout is a single JSON document matching the client's
 ``AvatarLoadout.to_json()`` shape. The server has no copy of the asset
 catalog, so it only validates the envelope (JSON object, non-empty
 ``base_body``); which assets are valid for which slot is the client's job.
 """
 from typing import Annotated, Any
 from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel, Field
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import get_db
 from app.dependencies import CurrentUser
 from app.models.avatar_loadout import AvatarLoadout, DEFAULT_LOADOUT
 router = APIRouter()
 DbDep = Annotated[AsyncSession, Depends(get_db)]
 # A loadout document is small; reject anything absurd outright.
 MAX_LOADOUT_BYTES = 16 * 1024
 class LoadoutResponse(BaseModel):
    data: dict[str, Any]
    is_default: bool = Field(
        description="True when the user has never saved a loadout and this is "
        "the server default."
    )
 class LoadoutUpdate(BaseModel):
    data: dict[str, Any]
 def _validate_envelope(data: dict[str, Any]) -> None:
    base_body = data.get("base_body")
    if not isinstance(base_body, str) or not base_body.strip():
        raise HTTPException(
            status_code=422,
            detail="loadout.data must have a non-empty string 'base_body'",
        )
    slots = data.get("slots", {})
    if not isinstance(slots, dict):
        raise HTTPException(status_code=422, detail="loadout.data.slots must be an object")
    if len(str(data)) > MAX_LOADOUT_BYTES:
        raise HTTPException(status_code=413, detail="loadout document too large")
@router.get("/loadout", response_model=LoadoutResponse)
 async def get_loadout(current_user: CurrentUser, db: DbDep):
    """Return the current user's saved loadout, or the server default if they
    have never saved one."""
    row = await db.get(AvatarLoadout, current_user.id)
    if row is None:
        return LoadoutResponse(data=dict(DEFAULT_LOADOUT), is_default=True)
    return LoadoutResponse(data=row.data, is_default=False)
@router.put("/loadout", response_model=LoadoutResponse)
 async def put_loadout(payload: LoadoutUpdate, current_user: CurrentUser, db: DbDep):
    """Replace the current user's loadout."""
    _validate_envelope(payload.data)
    row = await db.get(AvatarLoadout, current_user.id)
    if row is None:
        row = AvatarLoadout(user_id=current_user.id, data=payload.data)
        db.add(row)
    else:
        row.data = payload.data
    await db.commit()
    await db.refresh(row)
    return LoadoutResponse(data=row.data, is_default=False)
@@ -1,146 +0,0 @@
 """Internal, dedicated-server-only content API.
 Implements `docs/architecture/world_persistence_impl.md` §7 + §8.3. This is
 how a spawned Godot dedicated server (`scripts/server.gd`, spawned by
 `app.services.game_servers`) pulls its world's content read-only over HTTP
 before binding its ENet port. Mounted at ``/api/internal`` -- a prefix that
 can also be blocked at the reverse proxy, per the doc's rejected-alternative
 note in §7.3.
 Gated by ``require_game_server`` (§7.3): a bearer token minted per spawn by
 ``GameServerSupervisor._spawn`` and checked against
 ``supervisor.validate_token(world_id, token)``. There is no user identity
 here at all -- these routes skip the per-user visibility check public
 routes apply, and apply no mature-content gating (gating is a client/user
 concern; the dedicated server still needs the geometry for collision).
 Read-only by construction: there is no write route here, and adding one
 would violate world_persistence_impl.md D2 (the FastAPI backend is the
 only writer).
 """
 from __future__ import annotations
 from typing import Annotated
 from fastapi import APIRouter, Depends, Header, HTTPException, Response
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import get_db
 from app.models.world import World
 from app.models.world_content import MAIN_ROOM_SLUG
 from app.services import chunk_codec
 from app.services.game_servers import supervisor
 from app.services.world_store import Bounds, WorldStore
 router = APIRouter()
 DbDep = Annotated[AsyncSession, Depends(get_db)]
 async def require_game_server(
    world_id: int,
    authorization: Annotated[str | None, Header()] = None,
 ) -> None:
    """world_persistence_impl.md §7.3. A path whose ``world_id`` differs
    from the token's world is 403 -- ``validate_token`` enforces that by
    construction (it looks the token up *by* ``world_id``)."""
    if not authorization or not authorization.lower().startswith("bearer "):
        raise HTTPException(status_code=401, detail="missing bearer token")
    token = authorization.split(" ", 1)[1].strip()
    if not token or not supervisor.validate_token(world_id, token):
        raise HTTPException(status_code=403, detail="invalid or expired server token")
 async def _get_world_or_404(world_id: int, db: AsyncSession) -> World:
    result = await db.execute(select(World).where(World.id == world_id))
    world = result.scalar_one_or_none()
    if world is None:
        raise HTTPException(status_code=404, detail="World not found")
    return world
 async def _resolve_room(store: WorldStore, db: AsyncSession, world_id: int, slug: str):
    room = await store.get_room(world_id, slug)
    if room is None and slug == MAIN_ROOM_SLUG:
        room = await store.get_or_create_main_room(world_id)
        await db.commit()
    return room
@router.get("/worlds/{world_id}/manifest", dependencies=[Depends(require_game_server)])
 async def manifest(world_id: int, db: DbDep):
    await _get_world_or_404(world_id, db)
    store = WorldStore(db)
    rooms = await store.list_rooms(world_id)
    if not rooms:
        rooms = [await store.get_or_create_main_room(world_id)]
        await db.commit()
    room_payloads = []
    for r in rooms:
        room_payloads.append({
            "slug": r.slug, "name": r.name, "grid": r.grid, "bounds": r.bounds,
            "spawn": r.spawn, "chunk_count": await store.count_chunks(r.id),
        })
    return {
        "world_id": world_id,
        "content_revision": await store.content_revision(world_id),
        "rooms": room_payloads,
    }
@router.get("/worlds/{world_id}/rooms/{slug}/chunks", dependencies=[Depends(require_game_server)])
 async def internal_list_chunks(
    world_id: int, slug: str, db: DbDep,
    cx_min: int | None = None, cx_max: int | None = None,
    cy_min: int | None = None, cy_max: int | None = None,
    cz: int | None = None,
 ):
    await _get_world_or_404(world_id, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    bounds = Bounds(cx_min=cx_min, cx_max=cx_max, cy_min=cy_min, cy_max=cy_max, cz=cz)
    chunks = await store.list_chunks(world_id, room.id, bounds)
    return {
        "room": room.slug,
        "content_revision": await store.content_revision(world_id),
        "chunks": [
            {
                "key": c.chunk_key, "cx": c.cx, "cy": c.cy, "cz": c.cz,
                "revision": c.revision, "checksum": c.checksum, "payload_len": c.payload_len,
                "is_mature": c.is_mature,
                "updated_at": c.updated_at.isoformat() if c.updated_at else None,
            }
            for c in chunks
        ],
    }
@router.get(
    "/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}",
    dependencies=[Depends(require_game_server)],
 )
 async def internal_get_chunk(world_id: int, slug: str, cx: int, cy: int, cz: int, db: DbDep):
    await _get_world_or_404(world_id, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    key = chunk_codec.build_key(world_id, slug, cx, cy, cz)
    chunk = await store.get_chunk(key)
    if chunk is None:
        raise HTTPException(status_code=404, detail="chunk not found")
    return Response(
        content=chunk.payload, media_type="application/octet-stream",
        headers={
            "ETag": f'"{chunk.checksum}"', "X-Chunk-Revision": str(chunk.revision), "X-Chunk-Key": key,
        },
    )
@@ -1,146 +0,0 @@
 """Presence & status router.
 Endpoints:
 - POST  /api/presence/heartbeat  -- record a heartbeat (sets Redis TTL key)
 - GET   /api/presence/presence   -- query presence for a list of user ids
 - PATCH /api/presence/status     -- update the authenticated user's status message
 """
 from datetime import datetime, timezone
 from typing import Annotated
 from fastapi import APIRouter, HTTPException, status, Depends
 from pydantic import BaseModel, Field, field_validator
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from app.database import get_db
 from app.dependencies import CurrentUser
 from app.models.user import User
 from app.services.presence import presence_store
 router = APIRouter()
 DbDep = Annotated[AsyncSession, Depends(get_db)]
 # ──────────────────────────── Pydantic schemas ────────────────────────────────
 _STATUS_MAX_LEN = 140
 class HeartbeatRequest(BaseModel):
    """Empty body -- the caller's identity comes from the JWT."""
 class PresenceUser(BaseModel):
    user_id: int
    is_online: bool
    last_seen_at: datetime | None
    status_message: str | None
 class PresenceResponse(BaseModel):
    users: list[PresenceUser]
 class StatusUpdate(BaseModel):
    status_message: str | None = Field(default=None, max_length=_STATUS_MAX_LEN)
    @field_validator("status_message")
    @classmethod
    def strip_message(cls, v: str | None) -> str | None:
        if v is not None:
            v = v.strip()
        return v
 # ──────────────────────────────── Endpoints ───────────────────────────────────
@router.post("/heartbeat", response_model=dict)
 async def heartbeat(
    _req: HeartbeatRequest,
    current_user: CurrentUser,
    db: DbDep,
 ):
    """Record a heartbeat for the authenticated user.
    Sets a Redis key with a TTL so the server can derive online/offline
    status without trusting client claims. Also persists last_seen_at to
    the database.
    """
    # Update Redis TTL (presence heartbeat)
    await presence_store.heartbeat(current_user.id)
    # Persist last_seen_at to the database
    now = datetime.now(timezone.utc)
    result = await db.execute(select(User).where(User.id == current_user.id))
    user = result.scalar_one_or_none()
    if user:
        user.last_seen_at = now
        await db.commit()
    return {"status": "ok", "user_id": current_user.id}
@router.get("/presence", response_model=PresenceResponse)
 async def get_presence(
    user_ids: str,
    current_user: CurrentUser,
    db: DbDep,
 ):
    """Return presence info for a comma-separated list of user ids.
    Online/offline is derived from the Redis heartbeat TTL.
    last_seen_at and status_message come from the database.
    """
    ids = [int(uid.strip()) for uid in user_ids.split(",") if uid.strip()]
    if not ids:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="user_ids must contain at least one integer",
        )
    # Check Redis for online status (single round trip via MGET).
    online_ids = await presence_store.is_online_batch(ids)
    # Fetch DB records for last_seen_at and status_message
    result = await db.execute(select(User).where(User.id.in_(ids)))
    users = {u.id: u for u in result.scalars().all()}
    presence_users = []
    for uid in ids:
        user = users.get(uid)
        if user is None:
            continue
        presence_users.append(
            PresenceUser(
                user_id=uid,
                is_online=uid in online_ids,
                last_seen_at=user.last_seen_at,
                status_message=user.status_message,
            )
        )
    return PresenceResponse(users=presence_users)
@router.patch("/status", response_model=dict)
 async def update_status(
    body: StatusUpdate,
    current_user: CurrentUser,
    db: DbDep,
 ):
    """Update the authenticated user's status message (length-limited)."""
    result = await db.execute(select(User).where(User.id == current_user.id))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="User not found",
        )
    user.status_message = body.status_message
    await db.commit()
    return {"status": "ok", "status_message": body.status_message}
@@ -1,451 +0,0 @@
 """World content router -- rooms + chunks, for the editor and player client.
 Implements `docs/architecture/world_persistence_impl.md` §8.1. JWT-authenticated
 (``CurrentUser``, same as ``app/routers/worlds.py``). All chunk content
 reads/writes go through ``WorldStore``; this module is HTTP plumbing +
 authorization only.
 Authorization (doc §5.3):
 - **Read** (world visibility, room listing, chunk fetch/index/revisions):
   same rule as ``GET /api/worlds/{id}`` -- 404 (not 403) if the world is
   neither PUBLIC nor owned by the caller. See ``_get_world_readable``.
 - **Write** (room create, chunk PUT/DELETE/rollback): caller must be
   ``world.owner_id``, matching ``update_world`` -- 403 otherwise, with
   *no* visibility gate (this deliberately mirrors ``update_world``, which
   also has no visibility check; see ``_get_world_writable``).
 """
 from __future__ import annotations
 import base64
 import binascii
 from typing import Annotated
 from fastapi import APIRouter, Depends, Header, HTTPException, Request, Response
 from fastapi.responses import JSONResponse
 from pydantic import BaseModel, Field
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from app.config import settings
 from app.database import get_db
 from app.dependencies import CurrentUser
 from app.models.user import User
 from app.models.world import World, WorldVisibility
 from app.models.world_content import MAIN_ROOM_SLUG, WorldRoom
 from app.services import chunk_codec
 from app.services.game_servers import supervisor
 from app.services.world_store import Bounds, RevisionConflict, RevisionNotAvailable, WorldStore
 router = APIRouter()
 DbDep = Annotated[AsyncSession, Depends(get_db)]
 # world_persistence_impl.md §8.1: "Bounds are capped (default 32x32 chunks
 # per query) and return 422 beyond that."
 MAX_BOUNDS_SPAN = 32
 # §8.1 batch write cap, beyond WORLD_CHUNK_MAX_BATCH chunks: "Capped at ...
 # 8 MB."
 MAX_BATCH_TOTAL_BYTES = 8 * 1024 * 1024
 # ─────────────────────────── auth helpers ───────────────────────────
 async def _get_world_readable(world_id: int, current_user: User, db: AsyncSession) -> World:
    result = await db.execute(select(World).where(World.id == world_id))
    world = result.scalar_one_or_none()
    if world is None:
        raise HTTPException(status_code=404, detail="World not found")
    if world.visibility != WorldVisibility.PUBLIC and world.owner_id != current_user.id:
        raise HTTPException(status_code=404, detail="World not found")
    return world
 async def _get_world_writable(world_id: int, current_user: User, db: AsyncSession) -> World:
    result = await db.execute(select(World).where(World.id == world_id))
    world = result.scalar_one_or_none()
    if world is None:
        raise HTTPException(status_code=404, detail="World not found")
    if world.owner_id != current_user.id:
        raise HTTPException(status_code=403, detail="Not owner of this world")
    return world
 async def _resolve_room(store: WorldStore, db: AsyncSession, world_id: int, slug: str) -> WorldRoom | None:
    """world_persistence_impl.md §4.1: lazily create the main room for
    worlds that predate this feature, on first read/write."""
    room = await store.get_room(world_id, slug)
    if room is None and slug == MAIN_ROOM_SLUG:
        room = await store.get_or_create_main_room(world_id)
        await db.commit()
    return room
 def _is_live(world_id: int) -> bool:
    return any(s["world_id"] == str(world_id) for s in supervisor.debug_state())
 def _validation_error_body(exc: chunk_codec.ChunkValidationError) -> dict:
    return {"detail": "chunk validation failed", "reason": exc.reason}
 def _conflict_body(exc: RevisionConflict) -> dict:
    body: dict = {
        "detail": "revision conflict",
        "current_revision": exc.current_revision,
        "current_checksum": exc.current_checksum,
    }
    if exc.coord is not None:
        body["coord"] = list(exc.coord)
    return body
 # ─────────────────────────── schemas ───────────────────────────
 class RoomResponse(BaseModel):
    id: int
    slug: str
    name: str
    grid: dict
    bounds: dict | None
    spawn: dict | None
    chunk_count: int
 class RoomCreate(BaseModel):
    slug: str = Field(..., min_length=1, max_length=64, pattern=r"^[a-z0-9_-]+$")
    name: str = Field(..., min_length=1, max_length=255)
    grid: dict | None = None
    bounds: dict | None = None
    spawn: dict | None = None
 # ─────────────────────────── rooms ───────────────────────────
@router.get("/{world_id}/rooms", response_model=list[RoomResponse])
 async def list_rooms(world_id: int, current_user: CurrentUser, db: DbDep):
    await _get_world_readable(world_id, current_user, db)
    store = WorldStore(db)
    rooms = await store.list_rooms(world_id)
    if not rooms:
        rooms = [await store.get_or_create_main_room(world_id)]
        await db.commit()
    return [
        RoomResponse(
            id=r.id, slug=r.slug, name=r.name, grid=r.grid, bounds=r.bounds, spawn=r.spawn,
            chunk_count=await store.count_chunks(r.id),
        )
        for r in rooms
    ]
@router.post("/{world_id}/rooms", response_model=RoomResponse, status_code=201)
 async def create_room(world_id: int, body: RoomCreate, current_user: CurrentUser, db: DbDep):
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    if await store.get_room(world_id, body.slug) is not None:
        raise HTTPException(status_code=409, detail="a room with this slug already exists")
    room = await store.create_room(
        world_id, body.slug, body.name, grid=body.grid, bounds=body.bounds, spawn=body.spawn
    )
    await db.commit()
    await db.refresh(room)
    return RoomResponse(
        id=room.id, slug=room.slug, name=room.name, grid=room.grid,
        bounds=room.bounds, spawn=room.spawn, chunk_count=0,
    )
 # ─────────────────────────── chunk index ───────────────────────────
@router.get("/{world_id}/rooms/{slug}/chunks")
 async def list_chunks(
    world_id: int, slug: str, current_user: CurrentUser, db: DbDep,
    cx_min: int | None = None, cx_max: int | None = None,
    cy_min: int | None = None, cy_max: int | None = None,
    cz: int | None = None,
 ):
    await _get_world_readable(world_id, current_user, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    if cx_min is not None and cx_max is not None and (cx_max - cx_min + 1) > MAX_BOUNDS_SPAN:
        raise HTTPException(status_code=422, detail=f"cx bounds span exceeds {MAX_BOUNDS_SPAN}")
    if cy_min is not None and cy_max is not None and (cy_max - cy_min + 1) > MAX_BOUNDS_SPAN:
        raise HTTPException(status_code=422, detail=f"cy bounds span exceeds {MAX_BOUNDS_SPAN}")
    bounds = Bounds(cx_min=cx_min, cx_max=cx_max, cy_min=cy_min, cy_max=cy_max, cz=cz)
    chunks = await store.list_chunks(world_id, room.id, bounds)
    content_revision = await store.content_revision(world_id)
    return {
        "room": room.slug,
        "content_revision": content_revision,
        "chunks": [
            {
                "key": c.chunk_key, "cx": c.cx, "cy": c.cy, "cz": c.cz,
                "revision": c.revision, "checksum": c.checksum, "payload_len": c.payload_len,
                "is_mature": c.is_mature,
                "updated_at": c.updated_at.isoformat() if c.updated_at else None,
            }
            for c in chunks
        ],
    }
 # ─────────────────────────── chunk fetch ───────────────────────────
@router.get("/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}")
 async def get_chunk(
    world_id: int, slug: str, cx: int, cy: int, cz: int,
    current_user: CurrentUser, db: DbDep,
    accept: Annotated[str | None, Header()] = None,
    if_none_match: Annotated[str | None, Header(alias="If-None-Match")] = None,
 ):
    await _get_world_readable(world_id, current_user, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    key = chunk_codec.build_key(world_id, slug, cx, cy, cz)
    chunk = await store.get_chunk(key)
    if chunk is None:
        raise HTTPException(status_code=404, detail="chunk not found")
    etag = f'"{chunk.checksum}"'
    headers = {"ETag": etag, "X-Chunk-Revision": str(chunk.revision), "X-Chunk-Key": key}
    if if_none_match is not None and if_none_match.strip('"') == chunk.checksum:
        return Response(status_code=304, headers=headers)
    wants_json = (
        accept is not None
        and "application/json" in accept
        and "application/octet-stream" not in accept
    )
    if wants_json:
        decoded = chunk_codec.decode_binary(chunk.payload)
        body = chunk_codec.to_json_dict(decoded, key=key, chunk_checksum=chunk.checksum)
        return JSONResponse(content=body, headers=headers)
    return Response(content=chunk.payload, media_type="application/octet-stream", headers=headers)
 # ─────────────────────────── chunk write ───────────────────────────
 async def _read_write_payload(request: Request, x_base_revision: int | None) -> tuple[bytes, int]:
    content_type = request.headers.get("content-type", "")
    if "application/json" in content_type:
        body = await request.json()
        try:
            payload_bytes = base64.b64decode(body["payload_b64"], validate=True)
        except (KeyError, binascii.Error, ValueError) as exc:
            raise HTTPException(status_code=422, detail=f"invalid payload_b64: {exc}")
        base_revision = int(body.get("base_revision", 0))
        return payload_bytes, base_revision
    payload_bytes = await request.body()
    return payload_bytes, (x_base_revision if x_base_revision is not None else 0)
@router.put("/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}")
 async def put_chunk(
    world_id: int, slug: str, cx: int, cy: int, cz: int,
    request: Request, current_user: CurrentUser, db: DbDep,
    x_base_revision: Annotated[int | None, Header(alias="X-Base-Revision")] = None,
 ):
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    payload_bytes, base_revision = await _read_write_payload(request, x_base_revision)
    if len(payload_bytes) > settings.WORLD_CHUNK_MAX_PAYLOAD_BYTES:
        raise HTTPException(
            status_code=413,
            detail=f"payload exceeds WORLD_CHUNK_MAX_PAYLOAD_BYTES ({settings.WORLD_CHUNK_MAX_PAYLOAD_BYTES})",
        )
    try:
        chunk = await store.put_chunk(
            room=room, cx=cx, cy=cy, cz=cz, payload_bytes=payload_bytes,
            base_revision=base_revision, actor_id=current_user.id,
        )
    except chunk_codec.ChunkCodecError as exc:
        await db.rollback()
        return JSONResponse(status_code=422, content={"detail": "chunk decode failed", "reason": "malformed", "message": str(exc)})
    except chunk_codec.ChunkValidationError as exc:
        await db.rollback()
        return JSONResponse(status_code=422, content=_validation_error_body(exc))
    except RevisionConflict as exc:
        # Nothing must stick from a failed write. Returning a JSONResponse
        # here (rather than raising) means no exception propagates through
        # `get_db`, so this rollback has to be explicit -- see the note on
        # the batch endpoint below, where this is load-bearing for
        # all-or-nothing semantics.
        await db.rollback()
        return JSONResponse(status_code=409, content=_conflict_body(exc))
    await db.commit()
    await db.refresh(chunk)
    return {
        "key": chunk.chunk_key, "revision": chunk.revision, "checksum": chunk.checksum,
        "payload_len": chunk.payload_len,
        "updated_at": chunk.updated_at.isoformat() if chunk.updated_at else None,
        "is_mature": chunk.is_mature, "live_session": _is_live(world_id),
    }
 # ─────────────────────────── batch write ───────────────────────────
 class BatchChunkItem(BaseModel):
    cx: int
    cy: int
    cz: int
    base_revision: int
    payload_b64: str
 class BatchPutRequest(BaseModel):
    chunks: list[BatchChunkItem]
@router.put("/{world_id}/rooms/{slug}/chunks")
 async def put_chunks_batch(
    world_id: int, slug: str, body: BatchPutRequest, current_user: CurrentUser, db: DbDep,
 ):
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    if len(body.chunks) > settings.WORLD_CHUNK_MAX_BATCH:
        raise HTTPException(
            status_code=422,
            detail=f"batch of {len(body.chunks)} exceeds WORLD_CHUNK_MAX_BATCH ({settings.WORLD_CHUNK_MAX_BATCH})",
        )
    items = []
    total_bytes = 0
    for item in body.chunks:
        try:
            payload_bytes = base64.b64decode(item.payload_b64, validate=True)
        except (binascii.Error, ValueError) as exc:
            raise HTTPException(status_code=422, detail=f"invalid payload_b64 for ({item.cx},{item.cy},{item.cz}): {exc}")
        total_bytes += len(payload_bytes)
        items.append({
            "cx": item.cx, "cy": item.cy, "cz": item.cz,
            "base_revision": item.base_revision, "payload_bytes": payload_bytes,
        })
    if total_bytes > MAX_BATCH_TOTAL_BYTES:
        raise HTTPException(status_code=413, detail=f"batch exceeds {MAX_BATCH_TOTAL_BYTES} bytes")
    try:
        rows = await store.put_chunks_batch(room=room, items=items, actor_id=current_user.id)
    except chunk_codec.ChunkCodecError as exc:
        # All-or-nothing (world_persistence_impl.md §8.1): earlier items in
        # this batch may already be flushed (but never committed) to this
        # transaction. Rolling back here is what actually makes the batch
        # atomic -- without it, returning a JSONResponse instead of raising
        # means no exception reaches `get_db`, and its own transaction
        # handling would otherwise commit those earlier writes anyway.
        await db.rollback()
        return JSONResponse(status_code=422, content={"detail": "chunk decode failed", "reason": "malformed", "message": str(exc)})
    except chunk_codec.ChunkValidationError as exc:
        await db.rollback()
        return JSONResponse(status_code=422, content=_validation_error_body(exc))
    except RevisionConflict as exc:
        await db.rollback()
        return JSONResponse(status_code=409, content=_conflict_body(exc))
    await db.commit()
    for row in rows:
        await db.refresh(row)
    return {
        "live_session": _is_live(world_id),
        "chunks": [
            {
                "key": r.chunk_key, "revision": r.revision, "checksum": r.checksum,
                "payload_len": r.payload_len,
                "updated_at": r.updated_at.isoformat() if r.updated_at else None,
                "is_mature": r.is_mature,
            }
            for r in rows
        ],
    }
 # ─────────────────────────── delete ───────────────────────────
@router.delete("/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}", status_code=204)
 async def delete_chunk(
    world_id: int, slug: str, cx: int, cy: int, cz: int, current_user: CurrentUser, db: DbDep,
 ):
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    room = await _resolve_room(store, db, world_id, slug)
    if room is None:
        raise HTTPException(status_code=404, detail="room not found")
    key = chunk_codec.build_key(world_id, slug, cx, cy, cz)
    await store.delete_chunk(key, current_user.id)
    await db.commit()
    return Response(status_code=204)
 # ─────────────────────────── revisions + rollback ───────────────────────────
@router.get("/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}/revisions")
 async def chunk_revisions(
    world_id: int, slug: str, cx: int, cy: int, cz: int, current_user: CurrentUser, db: DbDep,
 ):
    # doc: "(owner)" -- same gate as writes.
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    key = chunk_codec.build_key(world_id, slug, cx, cy, cz)
    revisions = await store.list_revisions(key)
    return [
        {
            "revision": r.revision, "action": r.action, "actor_id": r.actor_id,
            "checksum": r.checksum, "payload_available": r.payload is not None,
            "created_at": r.created_at.isoformat() if r.created_at else None,
        }
        for r in revisions
    ]
 class RollbackRequest(BaseModel):
    revision: int
@router.post("/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}/rollback")
 async def rollback_chunk(
    world_id: int, slug: str, cx: int, cy: int, cz: int,
    body: RollbackRequest, current_user: CurrentUser, db: DbDep,
 ):
    await _get_world_writable(world_id, current_user, db)
    store = WorldStore(db)
    key = chunk_codec.build_key(world_id, slug, cx, cy, cz)
    try:
        chunk = await store.rollback_chunk(key, body.revision, current_user.id)
    except RevisionNotAvailable as exc:
        await db.rollback()
        return JSONResponse(status_code=404, content={"detail": str(exc)})
    except chunk_codec.ChunkValidationError as exc:
        await db.rollback()
        return JSONResponse(status_code=422, content=_validation_error_body(exc))
    await db.commit()
    await db.refresh(chunk)
    return {
        "key": chunk.chunk_key, "revision": chunk.revision, "checksum": chunk.checksum,
        "payload_len": chunk.payload_len,
        "updated_at": chunk.updated_at.isoformat() if chunk.updated_at else None,
        "is_mature": chunk.is_mature, "live_session": _is_live(world_id),
    }
@@ -12,8 +12,6 @@ from sqlalchemy.orm import selectinload
 from app.database import get_db
 from app.dependencies import CurrentUser
 from app.models.world import World, WorldVisibility
 from app.services.game_servers import supervisor
 from app.services.world_store import WorldStore
 router = APIRouter()
@@ -108,52 +106,13 @@ async def get_world(
    return world
 class JoinResponse(BaseModel):
    """Address of the dedicated server hosting this world."""
    world_id: int
    host: str
    port: int
@router.post("/{world_id}/join", response_model=JoinResponse)
 async def join_world(
    world_id: int,
    current_user: CurrentUser,
    db: DbDep,
 ):
    """Ensure a dedicated game server is running for this world and return its
    ENet address for the client to connect to.
    503 if game-server orchestration isn't enabled on this backend (e.g. a
    plain dev/test instance with no Godot binary).
    """
    result = await db.execute(select(World).where(World.id == world_id))
    world = result.scalar_one_or_none()
    if not world:
        raise HTTPException(status_code=404, detail="World not found")
    if world.visibility != WorldVisibility.PUBLIC and world.owner_id != current_user.id:
        raise HTTPException(status_code=404, detail="World not found")
    try:
        info = await supervisor.ensure_server(str(world_id))
    except RuntimeError as exc:
        raise HTTPException(status_code=503, detail=str(exc))
    return JoinResponse(world_id=world_id, host=info["host"], port=info["port"])
@router.post("/", response_model=WorldResponse, status_code=201)
 async def create_world(
    world_data: WorldCreate,
    current_user: CurrentUser,
    db: DbDep,
 ):
-    """Create a new world.
+    """Create a new world."""
    Also creates the world's "main" room (world_persistence_impl.md §4.1) --
    every world gets one so chunk content has somewhere to live from the
    start.
    """
    world = World(
        name=world_data.name,
        description=world_data.description,
@@ -161,8 +120,6 @@ async def create_world(
        visibility=world_data.visibility,
    )
    db.add(world)
    await db.flush()  # assigns world.id, needed for the room's FK
    await WorldStore(db).get_or_create_main_room(world.id)
    await db.commit()
    await db.refresh(world)
    return world
@@ -1,676 +0,0 @@
 """Python port of the chunk binary/JSON codec, `docs/architecture/world.md` §3.
 This is the server-side half of the "single shared format, two
 implementations" contract world.md §5.2 and
 `world_persistence_impl.md` §5.5/§9 call for. The Godot-side implementation
 is `scripts/chunk_data_decoder.gd`; this module must decode anything it
 produces and produce bytes it can decode.
 IMPORTANT DEVIATION (see the "Known cross-codec divergence" note at the
 bottom of this file): the current `scripts/chunk_data_decoder.gd` does not
 actually implement IEEE-754 float32 for the `pos`/`rot`/`scale`/`bounds`
 fields -- it performs a lossy numeric `int`/`float` cast instead of a bit
 reinterpretation, which both truncates fractional values and does not
 write IEEE-754 bits at all. This module implements the format as
 *specified* (real `<f` IEEE-754 float32, matching every other field in the
 spec and matching what any conformant decoder would assume). See the note
 for what this means for cross-codec byte parity today.
 Nothing here talks to a database or the FastAPI app; it is a pure,
 side-effect-free codec so it can be golden-file tested in isolation.
 """
 from __future__ import annotations
 import hashlib
 import json
 import struct
 from dataclasses import dataclass, field
 MAGIC = b"AGPC"
 HEADER_SIZE = 48
 CURRENT_VERSION = 1
 SECTION_META = 0x01
 SECTION_TILE = 0x02
 SECTION_OBJECT = 0x03
 SECTION_FLAGS = 0x04
 SECTION_REVISION_META = 0x05
 CATEGORY_FIELDS = (
    "violence", "sexual", "language", "substance",
    "gambling", "horror", "hate", "custom",
 )
 class ChunkCodecError(Exception):
    """Malformed bytes -- the payload isn't shaped like a chunk at all."""
 class ChunkValidationError(Exception):
    """A structurally-valid chunk failed a content/business-rule check.
    ``reason`` is the machine-readable code the API surface (world_persistence_impl.md
    §8.1) puts in the 422 response body's ``reason`` field, e.g.
    ``"checksum_mismatch"``, ``"layer_dims"``, ``"object_out_of_bounds"``.
    """
    def __init__(self, reason: str, message: str | None = None) -> None:
        self.reason = reason
        super().__init__(message or reason)
 # ───────────────────────── Logical model ─────────────────────────
@dataclass
 class TileDef:
    id: int
    asset_id: str = ""
    solid: bool = False
    flags: int = 0
    variants: int = 1
@dataclass
 class TileLayer:
    name: str
    layer_id: int = 0
    width: int = 0
    height: int = 0
    depth: int = 1
    palette: list[TileDef] = field(default_factory=list)
    tiles: list[int] = field(default_factory=list)  # flattened, row-major
@dataclass
 class ContentFlags:
    violence: int = 0
    sexual: int = 0
    language: int = 0
    substance: int = 0
    gambling: int = 0
    horror: int = 0
    hate: int = 0
    custom: int = 0
    mature: bool = False
    sources: list[str] = field(default_factory=list)
    def to_dict(self) -> dict:
        return {
            "categories": {name: getattr(self, name) for name in CATEGORY_FIELDS},
            "mature": self.mature,
            "sources": list(self.sources),
        }
    @classmethod
    def from_dict(cls, d: dict) -> "ContentFlags":
        cats = d.get("categories", {})
        return cls(
            **{name: int(cats.get(name, 0)) for name in CATEGORY_FIELDS},
            mature=bool(d.get("mature", False)),
            sources=list(d.get("sources", [])),
        )
@dataclass
 class WorldObject:
    id: str
    type: str
    asset_id: str
    pos: tuple[float, float, float] = (0.0, 0.0, 0.0)
    rot: tuple[float, float, float, float] = (0.0, 0.0, 0.0, 1.0)
    scale: tuple[float, float, float] = (1.0, 1.0, 1.0)
    dynamic: bool = False
    properties: dict = field(default_factory=dict)
    flags: ContentFlags = field(default_factory=ContentFlags)
@dataclass
 class ChunkBounds:
    """Stored here as min-corner + size (matching the Godot client's AABB
    type) for convenience, but the §3.6 BINARY wire format is min + max
    (world.md §3.1, and the client's actual ChunkDataDecoder) -- fixed
    2026-09-14 after a real client/server interop test caught this class's
    original binary codec writing min+size on the wire, which the client
    decoder (unaware of the "size" convention) read as a second min/max
    pair, corrupting every chunk's bounds. The two representations are
    fully recoverable from each other; `max` below is computed for exactly
    this reason."""
    min: tuple[float, float, float] = (0.0, 0.0, 0.0)
    size: tuple[float, float, float] = (0.0, 0.0, 0.0)
    @property
    def max(self) -> tuple[float, float, float]:
        return tuple(a + b for a, b in zip(self.min, self.size))
@dataclass
 class ChunkPayload:
    version: int = CURRENT_VERSION
    world_id: str = ""
    room_id: str = ""
    coord: tuple[int, int, int] = (0, 0, 0)
    bounds: ChunkBounds = field(default_factory=ChunkBounds)
    tile_layers: list[TileLayer] = field(default_factory=list)
    objects: list[WorldObject] = field(default_factory=list)
    flags: ContentFlags = field(default_factory=ContentFlags)
    created_at: int = 0
    updated_at: int = 0
    revision: int = 0
    author: str = ""
 def build_key(world_id: str | int, room_slug: str, cx: int, cy: int, cz: int) -> str:
    """world_persistence_impl.md §4.5: ``"{world.id}:{room.slug}:{cx}:{cy}:{cz}"``."""
    return f"{world_id}:{room_slug}:{cx}:{cy}:{cz}"
 # ───────────────────────── Binary primitives ─────────────────────────
 # All integers little-endian, matching world.md §3.6.3. Floats are packed
 # as real IEEE-754 float32 -- see the module docstring's deviation note.
 def _read_u16(data: bytes, off: int) -> int:
    return struct.unpack_from("<H", data, off)[0]
 def _read_u32(data: bytes, off: int) -> int:
    return struct.unpack_from("<I", data, off)[0]
 def _read_i32(data: bytes, off: int) -> int:
    return struct.unpack_from("<i", data, off)[0]
 def _read_i64(data: bytes, off: int) -> int:
    return struct.unpack_from("<q", data, off)[0]
 def _read_f32(data: bytes, off: int) -> float:
    return struct.unpack_from("<f", data, off)[0]
 def _w_u16(v: int) -> bytes:
    return struct.pack("<H", v & 0xFFFF)
 def _w_u32(v: int) -> bytes:
    return struct.pack("<I", v & 0xFFFFFFFF)
 def _w_i32(v: int) -> bytes:
    return struct.pack("<i", v)
 def _w_i64(v: int) -> bytes:
    return struct.pack("<q", v)
 def _w_f32(v: float) -> bytes:
    return struct.pack("<f", v)
 def _read_str(data: bytes, off: int) -> tuple[str, int]:
    """Length-prefixed UTF-8 string. Returns (value, next_offset)."""
    n = _read_u16(data, off)
    off += 2
    s = data[off:off + n].decode("utf-8")
    return s, off + n
 def _w_str(s: str) -> bytes:
    b = s.encode("utf-8")
    if len(b) > 0xFFFF:
        raise ChunkCodecError(f"string field too long to encode ({len(b)} bytes)")
    return _w_u16(len(b)) + b
 def checksum(payload_body: bytes) -> str:
    """SHA-256 hex digest of the payload body (world.md §3.6.3)."""
    return hashlib.sha256(payload_body).hexdigest()
 # ───────────────────────── Section codecs ─────────────────────────
 def _encode_metadata(payload: ChunkPayload) -> bytes:
    out = bytearray()
    out += _w_str(payload.world_id)
    out += _w_str(payload.room_id)
    out += _w_i32(payload.coord[0])
    out += _w_i32(payload.coord[1])
    out += _w_i32(payload.coord[2])
    out += _w_f32(payload.bounds.min[0])
    out += _w_f32(payload.bounds.min[1])
    out += _w_f32(payload.bounds.min[2])
    out += _w_f32(payload.bounds.max[0])
    out += _w_f32(payload.bounds.max[1])
    out += _w_f32(payload.bounds.max[2])
    return bytes(out)
 def _decode_metadata(data: bytes, result: ChunkPayload) -> None:
    off = 0
    result.world_id, off = _read_str(data, off)
    result.room_id, off = _read_str(data, off)
    coord = (_read_i32(data, off), _read_i32(data, off + 4), _read_i32(data, off + 8))
    off += 12
    min_pos = (_read_f32(data, off), _read_f32(data, off + 4), _read_f32(data, off + 8))
    max_pos = (_read_f32(data, off + 12), _read_f32(data, off + 16), _read_f32(data, off + 20))
    size = tuple(a - b for a, b in zip(max_pos, min_pos))
    result.coord = coord
    result.bounds = ChunkBounds(min=min_pos, size=size)
 def _encode_tile_layer(layer: TileLayer) -> bytes:
    out = bytearray()
    out += _w_str(layer.name)
    out += _w_u16(layer.layer_id)
    out += _w_u16(layer.width)
    out += _w_u16(layer.height)
    out += _w_u16(layer.depth)
    out += _w_u16(len(layer.palette))
    for td in layer.palette:
        out += _w_u16(td.id)
        out += _w_str(td.asset_id)
        out += bytes([1 if td.solid else 0])
        out += _w_u32(td.flags)
        out += bytes([td.variants & 0xFF])
    out += _w_u32(len(layer.tiles))
    for tile_id in layer.tiles:
        out += _w_u16(tile_id)
    return bytes(out)
 def _decode_tile_layer(data: bytes) -> TileLayer:
    off = 0
    name, off = _read_str(data, off)
    layer_id = _read_u16(data, off); off += 2
    width = _read_u16(data, off); off += 2
    height = _read_u16(data, off); off += 2
    depth = _read_u16(data, off); off += 2
    palette_count = _read_u16(data, off); off += 2
    palette: list[TileDef] = []
    for _ in range(palette_count):
        tid = _read_u16(data, off); off += 2
        asset_id, off = _read_str(data, off)
        solid = data[off] != 0; off += 1
        flags = _read_u32(data, off); off += 4
        variants = data[off]; off += 1
        palette.append(TileDef(id=tid, asset_id=asset_id, solid=solid, flags=flags, variants=variants))
    tile_count = _read_u32(data, off); off += 4
    tiles: list[int] = []
    for _ in range(tile_count):
        tiles.append(_read_u16(data, off))
        off += 2
    return TileLayer(name=name, layer_id=layer_id, width=width, height=height,
                      depth=depth, palette=palette, tiles=tiles)
 def _encode_flags(flags: ContentFlags) -> bytes:
    out = bytearray()
    for name in CATEGORY_FIELDS:
        out.append(getattr(flags, name) & 0xFF)
    out.append(1 if flags.mature else 0)
    out += _w_u16(len(flags.sources))
    for src in flags.sources:
        out += _w_str(src)
    return bytes(out)
 def _decode_flags(data: bytes) -> ContentFlags:
    off = 0
    values = {}
    for name in CATEGORY_FIELDS:
        values[name] = data[off]
        off += 1
    mature = data[off] != 0
    off += 1
    source_count = _read_u16(data, off)
    off += 2
    sources = []
    for _ in range(source_count):
        s, off = _read_str(data, off)
        sources.append(s)
    return ContentFlags(**values, mature=mature, sources=sources)
 def _encode_object(obj: WorldObject) -> bytes:
    out = bytearray()
    out += _w_str(obj.id)
    out += _w_str(obj.type)
    out += _w_str(obj.asset_id)
    for v in obj.pos:
        out += _w_f32(v)
    for v in obj.rot:
        out += _w_f32(v)
    for v in obj.scale:
        out += _w_f32(v)
    out.append(1 if obj.dynamic else 0)
    # Canonical JSON: keys sorted lexicographically (world.md §3.6.3).
    props_json = json.dumps(obj.properties, sort_keys=True, separators=(",", ":"))
    out += _w_str(props_json)
    out += _encode_flags(obj.flags)
    return bytes(out)
 def _decode_object(data: bytes) -> WorldObject:
    off = 0
    oid, off = _read_str(data, off)
    otype, off = _read_str(data, off)
    asset_id, off = _read_str(data, off)
    pos = (_read_f32(data, off), _read_f32(data, off + 4), _read_f32(data, off + 8))
    off += 12
    rot = (
        _read_f32(data, off), _read_f32(data, off + 4),
        _read_f32(data, off + 8), _read_f32(data, off + 12),
    )
    off += 16
    scale = (_read_f32(data, off), _read_f32(data, off + 4), _read_f32(data, off + 8))
    off += 12
    dynamic = data[off] != 0
    off += 1
    props_str, off = _read_str(data, off)
    try:
        properties = json.loads(props_str) if props_str else {}
    except json.JSONDecodeError as exc:
        raise ChunkCodecError(f"object {oid!r}: invalid properties JSON") from exc
    obj_flags = _decode_flags(data[off:])
    return WorldObject(id=oid, type=otype, asset_id=asset_id, pos=pos, rot=rot,
                        scale=scale, dynamic=dynamic, properties=properties, flags=obj_flags)
 def _encode_revision_meta(payload: ChunkPayload) -> bytes:
    out = bytearray()
    out += _w_i64(payload.created_at)
    out += _w_i64(payload.updated_at)
    out += _w_u32(payload.revision)
    out += _w_str(payload.author)
    return bytes(out)
 def _decode_revision_meta(data: bytes, result: ChunkPayload) -> None:
    off = 0
    result.created_at = _read_i64(data, off); off += 8
    result.updated_at = _read_i64(data, off); off += 8
    result.revision = _read_u32(data, off); off += 4
    result.author, off = _read_str(data, off)
 def _wrap_section(section_id: int, data: bytes) -> bytes:
    return bytes([section_id]) + _w_u32(len(data)) + data
 # ───────────────────────── Top-level encode/decode ─────────────────────────
 def encode_binary(payload: ChunkPayload) -> bytes:
    """Encode a ChunkPayload to the world.md §3.6 wire format."""
    sections = bytearray()
    sections += _wrap_section(SECTION_META, _encode_metadata(payload))
    for layer in payload.tile_layers:
        sections += _wrap_section(SECTION_TILE, _encode_tile_layer(layer))
    for obj in payload.objects:
        sections += _wrap_section(SECTION_OBJECT, _encode_object(obj))
    sections += _wrap_section(SECTION_FLAGS, _encode_flags(payload.flags))
    sections += _wrap_section(SECTION_REVISION_META, _encode_revision_meta(payload))
    payload_body = bytes(sections)
    digest = hashlib.sha256(payload_body).digest()  # 32 raw bytes
    header = bytearray()
    header += MAGIC
    header += _w_u16(CURRENT_VERSION)
    header += _w_u16(HEADER_SIZE - 8)  # header_len: bytes of header after this field (spec-correct)
    header += _w_u32(0)  # flags (reserved)
    header += _w_u32(len(payload_body))
    header += digest
    return bytes(header) + payload_body
 def decode_binary(data: bytes) -> ChunkPayload:
    """Decode a world.md §3.6 binary chunk. Raises ChunkCodecError on
    structurally malformed input (short buffer, bad magic, unsupported
    version, truncated payload)."""
    if len(data) < HEADER_SIZE:
        raise ChunkCodecError(f"data too short for header ({len(data)} bytes)")
    if data[0:4] != MAGIC:
        raise ChunkCodecError("bad magic bytes")
    version = _read_u16(data, 4)
    if version < 1 or version > CURRENT_VERSION:
        raise ChunkCodecError(f"unsupported chunk format version {version}")
    # header_len (offset 6) is intentionally not used for offset math --
    # both this decoder and the Godot one always slice at the fixed
    # HEADER_SIZE, matching the reference implementation's actual (if
    # spec-inconsistent) behaviour.
    payload_len = _read_u32(data, 12)
    # bytes 16:48 are the header's advisory checksum -- decode_and_validate
    # re-reads it directly and recomputes against the parsed payload body.
    if len(data) - HEADER_SIZE != payload_len:
        raise ChunkCodecError(
            f"declared payload_len ({payload_len}) does not match actual "
            f"remaining bytes ({len(data) - HEADER_SIZE})"
        )
    payload_body = data[HEADER_SIZE:HEADER_SIZE + payload_len]
    result = ChunkPayload(version=version)
    offset = 0
    while offset < len(payload_body):
        if offset + 5 > len(payload_body):
            raise ChunkCodecError("truncated section header")
        section_id = payload_body[offset]
        section_len = _read_u32(payload_body, offset + 1)
        data_start = offset + 5
        data_end = data_start + section_len
        if data_end > len(payload_body):
            raise ChunkCodecError("truncated section body")
        section_data = payload_body[data_start:data_end]
        if section_id == SECTION_META:
            _decode_metadata(section_data, result)
        elif section_id == SECTION_TILE:
            result.tile_layers.append(_decode_tile_layer(section_data))
        elif section_id == SECTION_OBJECT:
            result.objects.append(_decode_object(section_data))
        elif section_id == SECTION_FLAGS:
            result.flags = _decode_flags(section_data)
        elif section_id == SECTION_REVISION_META:
            _decode_revision_meta(section_data, result)
        # Unknown section ids are skipped (forward-compat), matching the
        # Godot decoder's match-with-no-default behaviour.
        offset = data_end
    return result
 # ───────────────────────── JSON encoding (world.md §3.5) ─────────────────────────
 # Derived, never stored (world_persistence_impl.md §8.1) -- produced here
 # from a decoded ChunkPayload for the ``Accept: application/json`` path.
 def to_json_dict(payload: ChunkPayload, *, key: str, chunk_checksum: str) -> dict:
    return {
        "version": payload.version,
        "key": key,
        "world_id": payload.world_id,
        "room_id": payload.room_id,
        "coord": {"cx": payload.coord[0], "cy": payload.coord[1], "cz": payload.coord[2]},
        "bounds": {
            "min_x": payload.bounds.min[0], "min_y": payload.bounds.min[1], "min_z": payload.bounds.min[2],
            "max_x": payload.bounds.max[0], "max_y": payload.bounds.max[1], "max_z": payload.bounds.max[2],
        },
        "tiles": [
            {
                "name": layer.name,
                "layer_id": layer.layer_id,
                "width": layer.width,
                "height": layer.height,
                "depth": layer.depth,
                "palette": [
                    {"id": td.id, "asset_id": td.asset_id, "solid": td.solid,
                     "flags": td.flags, "variants": td.variants}
                    for td in layer.palette
                ],
                "tiles": list(layer.tiles),
            }
            for layer in payload.tile_layers
        ],
        "objects": [
            {
                "id": obj.id, "type": obj.type, "asset_id": obj.asset_id,
                "transform": {
                    "pos": list(obj.pos), "rot": list(obj.rot), "scale": list(obj.scale),
                },
                "properties": obj.properties,
                "dynamic": obj.dynamic,
                "flags": obj.flags.to_dict(),
            }
            for obj in payload.objects
        ],
        "flags": payload.flags.to_dict(),
        "meta": {
            "created_at": payload.created_at, "updated_at": payload.updated_at,
            "revision": payload.revision, "author": payload.author,
        },
        "checksum": chunk_checksum,
    }
 # ───────────────────────── Validation (world_persistence_impl.md §5.5) ─────────────────────────
 # Not precisely quantified by the design doc beyond "length limits" --
 # these are this implementation's conservative defaults (world.md §7).
 MAX_STRING_FIELD_LEN = 256
 MAX_PROPERTIES_JSON_LEN = 16_384
 MAX_SOURCES_PER_FLAGSET = 32
 def _check_string_lengths(obj: WorldObject) -> None:
    for field_name, value in (("id", obj.id), ("type", obj.type), ("asset_id", obj.asset_id)):
        if len(value) > MAX_STRING_FIELD_LEN:
            raise ChunkValidationError(
                "string_field_too_long", f"object.{field_name} exceeds {MAX_STRING_FIELD_LEN} chars"
            )
    props_json = json.dumps(obj.properties)
    if len(props_json) > MAX_PROPERTIES_JSON_LEN:
        raise ChunkValidationError(
            "string_field_too_long", f"object {obj.id!r} properties exceed {MAX_PROPERTIES_JSON_LEN} bytes"
        )
    if len(obj.flags.sources) > MAX_SOURCES_PER_FLAGSET:
        raise ChunkValidationError("string_field_too_long", f"object {obj.id!r} has too many flag sources")
 def decode_and_validate(
    data: bytes,
    *,
    expected_key: str,
    grid_size: tuple[int, int, int],
    max_objects: int,
 ) -> ChunkPayload:
    """Decode + fully validate a client-submitted chunk payload.
    This is the boundary world_persistence_impl.md §5.5 requires: "the
    backend must not trust the client". Raises ``ChunkCodecError`` for
    structurally malformed bytes (mapped to a 422 by the router with a
    generic reason) or ``ChunkValidationError`` with a specific ``reason``
    code for a well-formed-but-invalid payload.
    """
    payload = decode_binary(data)  # raises ChunkCodecError for structural problems first
    # Checksum is advisory in the header (world.md §7); the value that
    # matters is recomputed from the actual payload body we just parsed.
    payload_body = data[HEADER_SIZE:]
    recomputed = checksum(payload_body)
    header_checksum_hex = data[16:48].hex()
    if header_checksum_hex != recomputed:
        raise ChunkValidationError(
            "checksum_mismatch",
            "header checksum does not match the recomputed SHA-256 of the payload body",
        )
    actual_key = build_key(payload.world_id, payload.room_id, *payload.coord)
    if actual_key != expected_key:
        raise ChunkValidationError(
            "chunk_key_mismatch",
            f"payload key {actual_key!r} does not match URL {expected_key!r}",
        )
    for layer in payload.tile_layers:
        if (layer.width, layer.height, layer.depth) != tuple(grid_size):
            raise ChunkValidationError(
                "layer_dims",
                f"tile layer {layer.name!r} dims {(layer.width, layer.height, layer.depth)} "
                f"!= room grid {tuple(grid_size)}",
            )
        valid_ids = {0} | {td.id for td in layer.palette}
        for tile_id in layer.tiles:
            if tile_id not in valid_ids:
                raise ChunkValidationError(
                    "tile_out_of_palette",
                    f"tile layer {layer.name!r} references palette id {tile_id} not in its palette",
                )
        if len(layer.tiles) != layer.width * layer.height * layer.depth:
            raise ChunkValidationError(
                "layer_dims",
                f"tile layer {layer.name!r} has {len(layer.tiles)} cells, expected "
                f"{layer.width * layer.height * layer.depth}",
            )
    if len(payload.objects) > max_objects:
        raise ChunkValidationError(
            "too_many_objects", f"{len(payload.objects)} objects exceeds max {max_objects}"
        )
    bmin, bmax = payload.bounds.min, payload.bounds.max
    for obj in payload.objects:
        _check_string_lengths(obj)
        if not all(bmin[i] <= obj.pos[i] <= bmax[i] for i in range(3)):
            raise ChunkValidationError(
                "object_out_of_bounds",
                f"object {obj.id!r} position {obj.pos} outside chunk bounds "
                f"[{bmin}, {bmax}]",
            )
    if len(payload.author) > MAX_STRING_FIELD_LEN:
        raise ChunkValidationError("string_field_too_long", "meta.author too long")
    return payload
 # ───────────────────────── Known cross-codec divergence ─────────────────────────
 #
 # `scripts/chunk_data_decoder.gd`'s `_read_float32`/`_write_float32` do:
 #
 #     static func _write_float32(val: float) -> PackedByteArray:
 #         var bits := val as int
 #         return _write_uint32(bits)
 #
 #     static func _read_float32(data: PackedByteArray, offset: int) -> float:
 #         var bits := _read_uint32(data, offset)
 #         return bits as float
 #
 # `as` between int and float in GDScript is a numeric conversion, not a bit
 # reinterpretation (verified empirically against Godot 4.6.2 headless:
 # `1.5 as int` -> `1`, `1 as float` -> `1.0`; the IEEE-754 bit pattern of
 # 1.5f is 0x3FC00000 = 1069547520, not 1). So the shipped client codec
 # truncates every float32 field (bounds, object pos/rot/scale) to its
 # integer part and stores that integer as a raw int32 -- not as float32
 # bits at all. This is a real bug in already-merged, client-side code
 # (scripts/ is out of scope for this task) that breaks the "byte-stable
 # across two implementations" guarantee world.md §3.6.3 states.
 #
 # This module implements the *specified* format (real IEEE-754 float32)
 # rather than replicating that bug, because world.md §3.6 is normative and
 # says "float32" for these fields, and mirroring the bug would mean the
 # backend also corrupts every non-integer transform/bounds value it
 # stores. Practical effect until the client-side bug is fixed: payloads
 # with integer-only floats will decode identically on both sides; any
 # payload with a fractional position/rotation/scale/bounds value will not
 # be byte-identical (or numerically identical) between this module and the
 # current `scripts/chunk_data_decoder.gd`. This is flagged for the
 # client/editor follow-on task, not fixed here.
@@ -1,239 +0,0 @@
 """Game-server orchestration.
 On ``POST /api/worlds/{id}/join`` the backend ensures a headless Godot
 dedicated-server process is running for that world and returns its address.
 One process per world, keyed by ``world_id``. A background reaper kills a
 world's server once its status file reports zero players for
 ``GAME_SERVER_IDLE_TIMEOUT_SECONDS``.
 This lives in-process (a module-level singleton) rather than as a separate
 service, so the backend MUST run single-worker -- which it does
 (``uvicorn app.main:app`` with no ``--workers``). The Godot binary and
 project are on the host (see ``settings.GODOT_BIN`` / ``GAME_PROJECT_DIR``);
 the backend spawns them as subprocesses.
 Design notes / limits (PC3):
 - Port allocation is a linear scan of the configured range.
 - No crash-restart: if a server process dies, the next join respawns it.
   With world content now durable in Postgres (world_persistence_impl.md
   D2), this is genuinely safe rather than merely tolerated: the sim
   process holds no unsaved world content, so a reap/crash/kill can never
   lose world data.
 Per-spawn auth token (world_persistence_impl.md §7.3): each spawned server
 gets a random ``secrets.token_urlsafe(32)`` on its command line, which it
 uses as a Bearer token against ``/api/internal`` to pull its world's
 content read-only before binding its ENet port. The token grants access to
 exactly one world and dies with its process (the reaper's
 ``del self._servers[wid]`` invalidates it; see ``validate_token``).
 """
 from __future__ import annotations
 import asyncio
 import hmac
 import json
 import secrets
 import socket
 import subprocess
 import tempfile
 import time
 from dataclasses import dataclass, field
 from pathlib import Path
 from app.config import settings
@dataclass
 class _WorldServer:
    world_id: str
    port: int
    proc: subprocess.Popen
    status_path: Path
    token: str
    started_at: float = field(default_factory=time.time)
    last_join: float = field(default_factory=time.time)
    def status(self) -> dict:
        try:
            return json.loads(self.status_path.read_text())
        except (OSError, ValueError):
            return {}
    def player_count(self) -> int:
        return int(self.status().get("players", 0))
    def is_ready(self) -> bool:
        return self.status().get("ready") is True
    def alive(self) -> bool:
        return self.proc.poll() is None
    def stop(self) -> None:
        if self.alive():
            self.proc.terminate()
            try:
                self.proc.wait(timeout=10)
            except subprocess.TimeoutExpired:
                self.proc.kill()
        self.status_path.unlink(missing_ok=True)
 class GameServerSupervisor:
    def __init__(self) -> None:
        self._servers: dict[str, _WorldServer] = {}
        self._lock = asyncio.Lock()
        self._reaper: asyncio.Task | None = None
        self._runtime_dir = Path(tempfile.gettempdir()) / "agp-game-servers"
        self._runtime_dir.mkdir(parents=True, exist_ok=True)
    # ── lifecycle ────────────────────────────────────────────────────────
    def start(self) -> None:
        if not settings.GAME_SERVERS_ENABLED:
            return
        if self._reaper is None or self._reaper.done():
            self._reaper = asyncio.create_task(self._reap_loop())
    async def shutdown(self) -> None:
        if self._reaper:
            self._reaper.cancel()
        async with self._lock:
            for srv in list(self._servers.values()):
                srv.stop()
            self._servers.clear()
    # ── join ─────────────────────────────────────────────────────────────
    async def ensure_server(self, world_id: str) -> dict:
        """Return ``{"host", "port", "world_id"}`` for the world's dedicated
        server, spawning it if needed. Raises RuntimeError if orchestration
        is disabled or no port/engine is available."""
        if not settings.GAME_SERVERS_ENABLED:
            raise RuntimeError("game servers are not enabled on this backend")
        async with self._lock:
            srv = self._servers.get(world_id)
            if srv is not None and not srv.alive():
                srv.stop()
                srv = None
                del self._servers[world_id]
            if srv is None:
                srv = self._spawn(world_id)
                self._servers[world_id] = srv
                try:
                    await self._await_ready(srv)
                except TimeoutError:
                    # Real failure now, not a silent "hope it's fine" --
                    # see _await_ready's docstring. Don't leave a possibly
                    # half-started process registered.
                    srv.stop()
                    del self._servers[world_id]
                    raise RuntimeError(
                        f"dedicated server for world {world_id} did not become ready in time"
                    )
            srv.last_join = time.time()
            return {"host": settings.GAME_SERVER_HOST, "port": srv.port, "world_id": world_id}
    def validate_token(self, world_id: str, token: str) -> bool:
        """`require_game_server` dependency support (world_persistence_impl.md
        §7.3): true iff *token* is the live token for *world_id*'s server.
        A dict lookup, as the doc specifies, plus a constant-time compare
        since it's a bearer credential."""
        srv = self._servers.get(str(world_id))
        if srv is None or not srv.alive():
            return False
        return hmac.compare_digest(srv.token, token)
    # ── internals ────────────────────────────────────────────────────────
    def _spawn(self, world_id: str) -> _WorldServer:
        port = self._free_port()
        token = secrets.token_urlsafe(32)
        status_path = self._runtime_dir / f"world_{world_id}_{port}.json"
        status_path.unlink(missing_ok=True)
        cmd = [
            settings.GODOT_BIN, "--headless",
            "--path", settings.GAME_PROJECT_DIR,
            "res://scenes/server.tscn", "--",
            "--port", str(port),
            "--world", str(world_id),
            "--status-file", str(status_path),
            "--api-url", settings.GAME_SERVER_INTERNAL_API_URL,
            "--server-token", token,
        ]
        proc = subprocess.Popen(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        return _WorldServer(
            world_id=world_id, port=port, proc=proc, status_path=status_path, token=token
        )
    def _free_port(self) -> int:
        used = {s.port for s in self._servers.values()}
        for p in range(settings.GAME_SERVER_PORT_MIN, settings.GAME_SERVER_PORT_MAX + 1):
            if p in used:
                continue
            with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
                try:
                    s.bind(("0.0.0.0", p))
                    return p
                except OSError:
                    continue
        raise RuntimeError("no free game-server port in the configured range")
    async def _await_ready(self, srv: _WorldServer) -> None:
        """Wait for a ``"ready": true`` field in the status file
        (world_persistence_impl.md §7.4).
        This replaces the old ``_await_port``, which had two real bugs:
        it treated a bound UDP port as "ready", but with content loading
        the port binds *before* the server has fetched its world's rooms
        and chunks (world_persistence_impl.md §7.2 step 4) -- so a client
        could get handed an address for a server still mid-fetch. And it
        *failed open*: past its 8s deadline it simply returned, with no
        error, so ``ensure_server`` reported success for a server that may
        never have started at all. This raises ``TimeoutError`` instead,
        which ``ensure_server`` turns into a real 503 for the joining
        client, and also bails out early (same exception) if the process
        has already exited.
        """
        deadline = time.time() + settings.GAME_SERVER_READY_TIMEOUT_SECONDS
        while time.time() < deadline:
            if srv.is_ready():
                return
            if not srv.alive():
                raise TimeoutError(
                    f"server process for world {srv.world_id} exited before becoming ready"
                )
            await asyncio.sleep(0.25)
        raise TimeoutError(
            f"server for world {srv.world_id} did not report ready within "
            f"{settings.GAME_SERVER_READY_TIMEOUT_SECONDS}s"
        )
    async def _reap_loop(self) -> None:
        try:
            while True:
                await asyncio.sleep(30)
                async with self._lock:
                    now = time.time()
                    for wid, srv in list(self._servers.items()):
                        if not srv.alive():
                            srv.stop()
                            del self._servers[wid]
                            continue
                        idle_for = now - srv.last_join
                        if idle_for > settings.GAME_SERVER_IDLE_TIMEOUT_SECONDS and srv.player_count() == 0:
                            srv.stop()
                            del self._servers[wid]
        except asyncio.CancelledError:
            pass
    def debug_state(self) -> list[dict]:
        return [
            {
                "world_id": s.world_id, "port": s.port, "alive": s.alive(),
                "players": s.player_count(), "uptime_s": round(time.time() - s.started_at),
            }
            for s in self._servers.values()
        ]
 supervisor = GameServerSupervisor()
@@ -1,145 +0,0 @@
 """Redis-backed presence store.
 Presence is determined by a heartbeat TTL key in Redis:
 - heartbeat(user_id) sets a TTL key per user (default 60 s).
 - is_online(user_id) / is_online_batch(user_ids) check whether the key(s)
  exist.
 status_message and last_seen_at are persisted in the ``users`` table by the
 router (app/routers/presence.py); this store only owns the Redis side.
 The Redis client is created lazily, on first actual use, rather than
 requiring an explicit ``connect()`` call during app startup. This matters
 because FastAPI's lifespan handler does not run under the plain
 ``TestClient(app)`` instantiation this codebase's tests use (no
 ``with`` block), so anything that only connected during lifespan startup
 would never connect in tests. Lazy connection means the store works
 identically whether the app was started for real or is being driven by
 pytest.
 The client is also cached per-*event loop* rather than globally: the same
 plain ``TestClient(app)`` pattern can dispatch different requests onto
 different event loops (see the NullPool comment on ``_override_db`` in
 tests/conftest.py for the analogous asyncpg problem), and an
 ``aioredis.Redis`` connection, like an asyncpg connection, breaks with
 "Event loop is closed" if reused across loops. In the real running server
 there is exactly one event loop for the process lifetime, so this
 degrades to a single cached, pooled connection there.
 """
 from __future__ import annotations
 import asyncio
 import logging
 import redis.asyncio as aioredis
 from app.config import settings
 logger = logging.getLogger(__name__)
 # Key prefix for heartbeat entries.
 _PRESENCE_KEY_PREFIX = "presence:heartbeat:"
 # Default heartbeat TTL in seconds (1 minute).
 # Clients should heartbeat at least once per interval.
 _DEFAULT_HEARTBEAT_TTL = 60
 class PresenceStore:
    """Redis-backed presence store with async, lazily-connected operations."""
    def __init__(self, redis_url: str | None = None, heartbeat_ttl: int = _DEFAULT_HEARTBEAT_TTL):
        # redis_url is resolved from settings at first use (not at
        # construction time) so tests that override settings.REDIS_URL
        # before the first call still take effect -- this module is
        # imported (and the module-level singleton below constructed)
        # well before any such override runs.
        self._redis_url = redis_url
        self._heartbeat_ttl = heartbeat_ttl
        # Keyed by id(running loop) -- see the module docstring.
        self._clients: dict[int, aioredis.Redis] = {}
        self._connect_lock = asyncio.Lock()
    # ------------------------------------------------------------------
    # Lifecycle
    # ------------------------------------------------------------------
    async def _ensure_client(self) -> aioredis.Redis:
        """Return a connected client for the current event loop, connecting
        on first use per loop."""
        loop_key = id(asyncio.get_running_loop())
        client = self._clients.get(loop_key)
        if client is None:
            async with self._connect_lock:
                client = self._clients.get(loop_key)
                if client is None:
                    url = self._redis_url or settings.REDIS_URL
                    client = aioredis.from_url(
                        url,
                        encoding="utf-8",
                        decode_responses=True,
                    )
                    try:
                        await client.ping()
                    except Exception:
                        logger.warning("Redis ping failed for %s", url)
                        raise
                    self._clients[loop_key] = client
        return client
    async def close(self) -> None:
        """Close the Redis connection for the current event loop, if one was
        opened."""
        loop_key = id(asyncio.get_running_loop())
        client = self._clients.pop(loop_key, None)
        if client is not None:
            await client.aclose()
    # ------------------------------------------------------------------
    # Heartbeat
    # ------------------------------------------------------------------
    async def heartbeat(self, user_id: int) -> None:
        """Record a heartbeat for *user_id*.
        Sets a TTL key so that the user is considered online as long as
        heartbeats arrive at least once per heartbeat_ttl seconds.
        """
        client = await self._ensure_client()
        await client.set(self._heartbeat_key(user_id), "1", ex=self._heartbeat_ttl)
    # ------------------------------------------------------------------
    # Online checks
    # ------------------------------------------------------------------
    async def is_online(self, user_id: int) -> bool:
        """Return True if the user has a valid heartbeat key."""
        client = await self._ensure_client()
        exists = await client.exists(self._heartbeat_key(user_id))
        return bool(exists)
    async def is_online_batch(self, user_ids: list[int]) -> set[int]:
        """Return the subset of user_ids that currently have a valid
        heartbeat key. Uses MGET (one round trip) rather than one EXISTS
        per user.
        """
        if not user_ids:
            return set()
        client = await self._ensure_client()
        keys = [self._heartbeat_key(uid) for uid in user_ids]
        values = await client.mget(keys)
        return {uid for uid, v in zip(user_ids, values) if v is not None}
    # ------------------------------------------------------------------
    # Helpers
    # ------------------------------------------------------------------
    @staticmethod
    def _heartbeat_key(user_id: int) -> str:
        return f"{_PRESENCE_KEY_PREFIX}{user_id}"
 # Singleton instance shared by the router, so all requests share the same
 # connection pool.
 presence_store = PresenceStore()
@@ -1,431 +0,0 @@
 """World content storage service.
 Implements the `world.md` §5.1 service interface over Postgres, per
 `world_persistence_impl.md` §9 -- **minus** ``flush_dirty`` and
 ``rebuild_index``, which don't apply once there is no write-behind dirty
 set and no derived index to rebuild (see that doc's §3.3 and §4.2).
 This is the *only* place chunk content is written (world_persistence_impl.md
 D2 / §5). Callers (the routers) own transaction boundaries: methods here
 ``flush()`` so later statements in the same request see earlier ones and so
 integrity errors surface before a caller commits, but they never
 ``commit()`` -- that mirrors the existing convention in
 ``app/routers/worlds.py`` (``get_db`` docs: "Handlers are responsible for
 committing or rolling back their own transactions").
 Known gap this module had to resolve on its own (flagged, not silently
 decided): `world_persistence_impl.md` §6/§7.2/§8.1 all reference a world's
 monotonic ``content_revision`` ("bumped on every chunk write"), but no
 column for it is defined anywhere in §4's schema. Rather than add an
 undocumented column, ``content_revision()`` below derives it as
 ``MAX(id)`` over ``world_chunk_revisions`` scoped to the world: that table
 is append-only (retention only nulls ``payload``, it never deletes rows),
 so the value is genuinely monotonic and increments on every
 create/update/delete/rollback.
 """
 from __future__ import annotations
 from dataclasses import dataclass
 from sqlalchemy import func, select, update
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import load_only
 from app.config import settings
 from app.models.world_content import (
    MAIN_ROOM_NAME,
    MAIN_ROOM_SLUG,
    WorldChunk,
    WorldChunkRevision,
    WorldRoom,
 )
 from app.services import chunk_codec
 class RevisionConflict(Exception):
    """Optimistic-concurrency conflict (world.md §5.4). ``current_revision``
    is 0 and ``current_checksum`` is None when the caller's ``base_revision``
    assumed a chunk exists but it doesn't."""
    def __init__(
        self,
        current_revision: int,
        current_checksum: str | None,
        coord: tuple[int, int, int] | None = None,
    ) -> None:
        self.current_revision = current_revision
        self.current_checksum = current_checksum
        self.coord = coord
        super().__init__(f"revision conflict: current_revision={current_revision}")
 class RevisionNotAvailable(Exception):
    """Raised by ``rollback_chunk`` when the requested revision doesn't
    exist, or exists but its payload was pruned by the retention policy
    (world_persistence_impl.md §4.3)."""
@dataclass
 class Bounds:
    cx_min: int | None = None
    cx_max: int | None = None
    cy_min: int | None = None
    cy_max: int | None = None
    cz: int | None = None
 class WorldStore:
    """Owns chunk/room read/write operations over the async session
    handed to it. One instance per request is the expected usage
    (``WorldStore(db)`` where ``db`` is the ``DbDep`` session)."""
    def __init__(self, db: AsyncSession) -> None:
        self.db = db
    # ── rooms ────────────────────────────────────────────────────────────
    async def get_room(self, world_id: int, slug: str) -> WorldRoom | None:
        result = await self.db.execute(
            select(WorldRoom).where(WorldRoom.world_id == world_id, WorldRoom.slug == slug)
        )
        return result.scalar_one_or_none()
    async def list_rooms(self, world_id: int) -> list[WorldRoom]:
        result = await self.db.execute(
            select(WorldRoom).where(WorldRoom.world_id == world_id).order_by(WorldRoom.id)
        )
        return list(result.scalars().all())
    async def create_room(
        self,
        world_id: int,
        slug: str,
        name: str,
        *,
        grid: dict | None = None,
        bounds: dict | None = None,
        spawn: dict | None = None,
    ) -> WorldRoom:
        room = WorldRoom(world_id=world_id, slug=slug, name=name)
        if grid is not None:
            room.grid = grid
        if bounds is not None:
            room.bounds = bounds
        if spawn is not None:
            room.spawn = spawn
        self.db.add(room)
        await self.db.flush()
        await self.db.refresh(room)
        return room
    async def get_or_create_main_room(self, world_id: int) -> WorldRoom:
        """world_persistence_impl.md §4.1: every world gets a ``main`` room.
        Called from ``create_world`` for new worlds, and lazily here for
        worlds that predate this migration."""
        room = await self.get_room(world_id, MAIN_ROOM_SLUG)
        if room is not None:
            return room
        try:
            return await self.create_room(world_id, MAIN_ROOM_SLUG, MAIN_ROOM_NAME)
        except IntegrityError:
            # Lost a race with a concurrent creator; the row now exists.
            await self.db.rollback()
            room = await self.get_room(world_id, MAIN_ROOM_SLUG)
            if room is None:
                raise
            return room
    async def count_chunks(self, room_id: int) -> int:
        result = await self.db.execute(
            select(func.count()).select_from(WorldChunk).where(WorldChunk.room_id == room_id)
        )
        return int(result.scalar_one())
    async def content_revision(self, world_id: int) -> int:
        """See module docstring for why this is derived rather than stored."""
        result = await self.db.execute(
            select(func.max(WorldChunkRevision.id)).where(WorldChunkRevision.world_id == world_id)
        )
        return int(result.scalar() or 0)
    # ── chunk reads ──────────────────────────────────────────────────────
    async def get_chunk(self, key: str) -> WorldChunk | None:
        result = await self.db.execute(select(WorldChunk).where(WorldChunk.chunk_key == key))
        return result.scalar_one_or_none()
    async def get_chunk_by_coord(self, room_id: int, cx: int, cy: int, cz: int) -> WorldChunk | None:
        result = await self.db.execute(
            select(WorldChunk).where(
                WorldChunk.room_id == room_id, WorldChunk.cx == cx,
                WorldChunk.cy == cy, WorldChunk.cz == cz,
            )
        )
        return result.scalar_one_or_none()
    async def get_chunk_binary(self, key: str) -> bytes | None:
        chunk = await self.get_chunk(key)
        return chunk.payload if chunk is not None else None
    async def get_chunk_flags(self, key: str) -> dict | None:
        chunk = await self.get_chunk(key)
        return chunk.content_flags if chunk is not None else None
    async def list_chunks(
        self,
        world_id: int,
        room_id: int | None = None,
        bounds: Bounds | None = None,
    ) -> list[WorldChunk]:
        """Index query -- world.md §5.1's ``list_chunks``. Payload bytes are
        deliberately not loaded (world_persistence_impl.md §8.1: "Payloads
        are not included")."""
        query = select(WorldChunk).options(
            load_only(
                WorldChunk.id, WorldChunk.world_id, WorldChunk.room_id, WorldChunk.chunk_key,
                WorldChunk.cx, WorldChunk.cy, WorldChunk.cz, WorldChunk.revision,
                WorldChunk.checksum, WorldChunk.payload_len, WorldChunk.is_mature,
                WorldChunk.updated_at,
            )
        ).where(WorldChunk.world_id == world_id)
        if room_id is not None:
            query = query.where(WorldChunk.room_id == room_id)
        if bounds is not None:
            if bounds.cx_min is not None:
                query = query.where(WorldChunk.cx >= bounds.cx_min)
            if bounds.cx_max is not None:
                query = query.where(WorldChunk.cx <= bounds.cx_max)
            if bounds.cy_min is not None:
                query = query.where(WorldChunk.cy >= bounds.cy_min)
            if bounds.cy_max is not None:
                query = query.where(WorldChunk.cy <= bounds.cy_max)
            if bounds.cz is not None:
                query = query.where(WorldChunk.cz == bounds.cz)
        query = query.order_by(WorldChunk.cx, WorldChunk.cy, WorldChunk.cz)
        result = await self.db.execute(query)
        return list(result.scalars().all())
    # ── chunk writes ─────────────────────────────────────────────────────
    async def put_chunk(
        self,
        *,
        room: WorldRoom,
        cx: int,
        cy: int,
        cz: int,
        payload_bytes: bytes,
        base_revision: int,
        actor_id: int | None,
    ) -> WorldChunk:
        """Full-chunk write with optimistic concurrency (world.md §5.4,
        world_persistence_impl.md §5.4/§8.2). Validates the payload
        server-side (§5.5) before ever touching a row. ``base_revision=0``
        means "create; 409 if it already exists"."""
        key = chunk_codec.build_key(room.world_id, room.slug, cx, cy, cz)
        grid_size = tuple(room.grid.get("size", [32, 32, 1]))
        # Raises ChunkCodecError / ChunkValidationError -- the router maps
        # those to 422. Nothing below trusts the request body's own claims
        # about content_flags/is_mature; both come from `decoded`.
        decoded = chunk_codec.decode_and_validate(
            payload_bytes,
            expected_key=key,
            grid_size=grid_size,
            max_objects=settings.WORLD_CHUNK_MAX_OBJECTS,
        )
        body_checksum = chunk_codec.checksum(payload_bytes[chunk_codec.HEADER_SIZE:])
        result = await self.db.execute(
            select(WorldChunk)
            .where(
                WorldChunk.room_id == room.id, WorldChunk.cx == cx,
                WorldChunk.cy == cy, WorldChunk.cz == cz,
            )
            .with_for_update()
        )
        row = result.scalar_one_or_none()
        if base_revision == 0:
            if row is not None:
                raise RevisionConflict(row.revision, row.checksum, (cx, cy, cz))
            row = WorldChunk(
                world_id=room.world_id, room_id=room.id, chunk_key=key,
                cx=cx, cy=cy, cz=cz, revision=1,
            )
            self.db.add(row)
            action = "create"
        else:
            if row is None or row.revision != base_revision:
                raise RevisionConflict(
                    row.revision if row else 0, row.checksum if row else None, (cx, cy, cz)
                )
            row.revision = row.revision + 1
            action = "update"
        row.format_version = decoded.version
        row.payload = payload_bytes
        row.payload_len = len(payload_bytes)
        row.checksum = body_checksum
        row.content_flags = decoded.flags.to_dict()
        row.is_mature = decoded.flags.mature
        row.updated_by_id = actor_id
        try:
            await self.db.flush()
        except IntegrityError:
            # Lost a create race to a concurrent writer between our SELECT
            # and this flush. Roll back and report the real current state.
            await self.db.rollback()
            existing = await self.get_chunk_by_coord(room.id, cx, cy, cz)
            raise RevisionConflict(
                existing.revision if existing else 0,
                existing.checksum if existing else None,
                (cx, cy, cz),
            )
        await self._record_revision(key, room.world_id, row.revision, action, actor_id, body_checksum, payload_bytes)
        await self.db.refresh(row)
        return row
    async def put_chunks_batch(
        self,
        *,
        room: WorldRoom,
        items: list[dict],
        actor_id: int | None,
    ) -> list[WorldChunk]:
        """Batch write (world_persistence_impl.md §8.1). One transaction,
        all-or-nothing: none of this ``commit()``s, so a ``RevisionConflict``
        raised partway leaves nothing persisted once the caller's request
        handler lets the exception (or the HTTPException it becomes)
        propagate through ``get_db``, which rolls back on any exception."""
        rows: list[WorldChunk] = []
        for item in items:
            row = await self.put_chunk(
                room=room, cx=item["cx"], cy=item["cy"], cz=item["cz"],
                payload_bytes=item["payload_bytes"], base_revision=item["base_revision"],
                actor_id=actor_id,
            )
            rows.append(row)
        return rows
    async def delete_chunk(self, key: str, actor_id: int | None) -> None:
        row = await self.get_chunk(key)
        if row is None:
            return
        await self._record_revision(key, row.world_id, row.revision, "delete", actor_id, row.checksum, None)
        await self.db.delete(row)
        await self.db.flush()
    async def rollback_chunk(self, key: str, revision: int, actor_id: int | None) -> WorldChunk:
        """Restore a chunk to a previously-recorded revision's payload
        (world.md §5.1). Raises ``RevisionNotAvailable`` if that revision
        was never recorded, its payload was pruned by retention, or the
        chunk has since been deleted outright (nothing to update in place)."""
        rev_result = await self.db.execute(
            select(WorldChunkRevision)
            .where(WorldChunkRevision.chunk_key == key, WorldChunkRevision.revision == revision)
            .order_by(WorldChunkRevision.id.desc())
            .limit(1)
        )
        rev_row = rev_result.scalar_one_or_none()
        if rev_row is None:
            raise RevisionNotAvailable(f"no revision {revision} recorded for {key!r}")
        if rev_row.payload is None:
            raise RevisionNotAvailable(f"revision {revision} of {key!r} was pruned; payload unavailable")
        chunk = await self.get_chunk(key)
        if chunk is None:
            raise RevisionNotAvailable(f"chunk {key!r} no longer exists; cannot roll back in place")
        room_result = await self.db.execute(select(WorldRoom).where(WorldRoom.id == chunk.room_id))
        room = room_result.scalar_one()
        grid_size = tuple(room.grid.get("size", [32, 32, 1]))
        decoded = chunk_codec.decode_and_validate(
            rev_row.payload, expected_key=key, grid_size=grid_size,
            max_objects=settings.WORLD_CHUNK_MAX_OBJECTS,
        )
        body_checksum = chunk_codec.checksum(rev_row.payload[chunk_codec.HEADER_SIZE:])
        chunk.revision = chunk.revision + 1
        chunk.payload = rev_row.payload
        chunk.payload_len = len(rev_row.payload)
        chunk.checksum = body_checksum
        chunk.format_version = decoded.version
        chunk.content_flags = decoded.flags.to_dict()
        chunk.is_mature = decoded.flags.mature
        chunk.updated_by_id = actor_id
        await self.db.flush()
        # Tagged "update" (not a fourth action value) to keep the
        # documented 'create'|'update'|'delete' action enum intact.
        await self._record_revision(
            key, chunk.world_id, chunk.revision, "update", actor_id, body_checksum, rev_row.payload
        )
        await self.db.refresh(chunk)
        return chunk
    async def list_revisions(self, chunk_key: str, limit: int = 50) -> list[WorldChunkRevision]:
        """Not in world.md §5.1's interface by name, but required to
        implement the revision-history endpoint world_persistence_impl.md
        §8.1 lists (``GET .../revisions``)."""
        result = await self.db.execute(
            select(WorldChunkRevision)
            .where(WorldChunkRevision.chunk_key == chunk_key)
            .order_by(WorldChunkRevision.revision.desc(), WorldChunkRevision.id.desc())
            .limit(limit)
        )
        return list(result.scalars().all())
    async def migrate(self) -> None:
        """No-op. `world.md` §4.8's hand-rolled SQLite migration runner is
        superseded by Alembic (`backend/alembic/`) now that content lives
        in Postgres (world_persistence_impl.md §3.3). Kept only so this
        class's shape still matches the §5.1 interface it's implementing
        a subset of."""
        return None
    # ── internals ────────────────────────────────────────────────────────
    async def _record_revision(
        self,
        chunk_key: str,
        world_id: int,
        revision: int,
        action: str,
        actor_id: int | None,
        checksum_hex: str,
        payload_bytes: bytes | None,
    ) -> None:
        """Append an audit row and enforce the retention policy
        (world_persistence_impl.md §4.3, required): keep the newest
        ``WORLD_CHUNK_REVISION_KEEP`` payloads per ``chunk_key``, null out
        ``payload`` on older rows, in the same transaction as the write."""
        rev = WorldChunkRevision(
            chunk_key=chunk_key, world_id=world_id, revision=revision, action=action,
            actor_id=actor_id, checksum=checksum_hex, payload=payload_bytes,
        )
        self.db.add(rev)
        await self.db.flush()
        keep = settings.WORLD_CHUNK_REVISION_KEEP
        keep_ids_result = await self.db.execute(
            select(WorldChunkRevision.id)
            .where(WorldChunkRevision.chunk_key == chunk_key)
            .order_by(WorldChunkRevision.id.desc())
            .limit(keep)
        )
        keep_ids = [row[0] for row in keep_ids_result.all()]
        if keep_ids:
            await self.db.execute(
                update(WorldChunkRevision)
                .where(
                    WorldChunkRevision.chunk_key == chunk_key,
                    WorldChunkRevision.id.notin_(keep_ids),
                    WorldChunkRevision.payload.isnot(None),
                )
                .values(payload=None)
            )
@@ -1,222 +1,38 @@
-"""Shared pytest fixtures + hermetic-DB/Redis bootstrap.
+"""Shared pytest fixtures.
-The integration tests hit a real Postgres (Postgres-specific types: JSONB,
+The auth integration tests hit the *real* Postgres database (per
-native ENUMs) and, for presence tests, a real Redis (TTL semantics aren't
+``DATABASE_URL``), so they persist data between runs.  Without cleanup a
-worth faking). To make ``cd backend && pytest`` work from a clean checkout
+second run of the suite fails with 409 conflicts because the users it
-with no manual setup, ``pytest_configure`` below brings up ephemeral
+registered on the first run already exist.  The session-scoped fixture below
-Postgres/Redis containers via docker compose and runs the migrations IF
+truncates all application tables once before the first test, making the suite
-``DATABASE_URL``/``REDIS_URL`` aren't already pointing at something
+re-runnable.
 reachable. When they are (dev loop, or the checkpoint runner which stands
 these up itself), that path is skipped and the existing services are
 reused.
-If Docker isn't available and nothing is reachable, the whole
+Truncation order doesn't strictly matter because ``CASCADE`` follows foreign
-DB/Redis-backed suite is skipped with a clear message rather than erroring
+keys, but the tables are listed explicitly for clarity.
 out dozens of times.
 """
 import asyncio
 import os
 import socket
 import subprocess
 import sys
 import time
 from pathlib import Path
 from urllib.parse import urlsplit
 import pytest
 from sqlalchemy import text
-from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import create_async_engine
 from sqlalchemy.pool import NullPool
 from app.config import settings
 from app.database import get_db
 from app.main import app
-TEST_TABLES = (
+TEST_TABLES = ("assets", "worlds", "sessions", "refresh_tokens", "users")
    "avatar_loadouts", "assets",
    # world_chunk_revisions has no FK to worlds/world_chunks (world.md §4.7 /
    # world_persistence_impl.md §4.3, deliberate -- deleting a chunk or world
    # must not lose the audit trail), so it won't be cascade-truncated via
    # `worlds` the way world_rooms/world_chunks would be. List all three
    # explicitly rather than rely on cascade for some of them.
    "world_chunk_revisions", "world_chunks", "world_rooms",
    "worlds",
    # Social graph (app/models/social.py) -- all three FK users with
    # ON DELETE CASCADE, but list explicitly for clarity/consistency.
    "friendships", "follows", "blocks",
    "sessions", "refresh_tokens", "users",
 )
 BACKEND_DIR = Path(__file__).resolve().parents[1]
 _COMPOSE_PROJECT = "agp-pytest"
 _EPHEMERAL_PG_PORT = 25432
 _EPHEMERAL_REDIS_PORT = 26379
 # Set by pytest_configure() when it starts container(s) it owns; torn down in
 # pytest_unconfigure.
 _started_container = False
 _db_unavailable_reason: str | None = None
 def _port_open(host: str, port: int, timeout: float = 1.0) -> bool:
    try:
        with socket.create_connection((host, port), timeout=timeout):
            return True
    except OSError:
        return False
 def _db_reachable(url: str) -> bool:
    parts = urlsplit(url)
    return _port_open(parts.hostname or "localhost", parts.port or 5432)
 def _redis_reachable(url: str) -> bool:
    parts = urlsplit(url)
    return _port_open(parts.hostname or "localhost", parts.port or 6379)
 def _run(cmd: list[str], **kw) -> subprocess.CompletedProcess:
    return subprocess.run(cmd, cwd=BACKEND_DIR, capture_output=True, text=True, **kw)
 def pytest_configure(config):
    global _started_container, _db_unavailable_reason
    need_db = not _db_reachable(settings.DATABASE_URL)
    need_redis = not _redis_reachable(settings.REDIS_URL)
    if not need_db and not need_redis:
        return  # dev loop / checkpoint runner already provided both
    if not _run(["docker", "--version"]).returncode == 0:
        _db_unavailable_reason = (
            "no reachable DATABASE_URL/REDIS_URL and docker is unavailable -- run "
            "the checkpoint suite (scripts/run_checkpoint_tests.py) or start "
            "Postgres/Redis manually"
        )
        return
    env = os.environ.copy()
    env["COMPOSE_PROJECT_NAME"] = _COMPOSE_PROJECT
    env["POSTGRES_HOST_PORT"] = str(_EPHEMERAL_PG_PORT)
    env["POSTGRES_PORT"] = str(_EPHEMERAL_PG_PORT)
    env["REDIS_HOST_PORT"] = str(_EPHEMERAL_REDIS_PORT)
    services = [s for s, need in (("postgres", need_db), ("redis", need_redis)) if need]
    up = _run(["docker", "compose", "up", "-d", *services], env=env)
    if up.returncode != 0:
        _db_unavailable_reason = f"docker compose up {' '.join(services)} failed:\n{up.stderr[-800:]}"
        return
    _started_container = True
    if need_db:
        for _ in range(30):
            r = _run(
                ["docker", "compose", "exec", "-T", "postgres",
                 "pg_isready", "-U", "agp_user", "-d", "agp_db"],
                env=env,
            )
            if r.returncode == 0:
                break
            time.sleep(1)
        else:
            _db_unavailable_reason = "ephemeral Postgres never became ready"
            return
        url = f"postgresql+asyncpg://agp_user:agp_password@localhost:{_EPHEMERAL_PG_PORT}/agp_db"
        os.environ["DATABASE_URL"] = url
        settings.DATABASE_URL = url
        mig = _run([sys.executable, "-m", "alembic", "upgrade", "head"],
                   env={**os.environ, "DATABASE_URL": url})
        if mig.returncode != 0:
            _db_unavailable_reason = f"alembic upgrade head failed:\n{mig.stderr[-800:]}"
            return
    if need_redis:
        for _ in range(30):
            r = _run(
                ["docker", "compose", "exec", "-T", "redis", "redis-cli", "ping"],
                env=env,
            )
            if r.returncode == 0 and "PONG" in r.stdout:
                break
            time.sleep(1)
        else:
            _db_unavailable_reason = "ephemeral Redis never became ready"
            return
        redis_url = f"redis://localhost:{_EPHEMERAL_REDIS_PORT}/0"
        os.environ["REDIS_URL"] = redis_url
        settings.REDIS_URL = redis_url
 def pytest_unconfigure(config):
    if not _started_container:
        return
    env = os.environ.copy()
    env["COMPOSE_PROJECT_NAME"] = _COMPOSE_PROJECT
    env["POSTGRES_HOST_PORT"] = str(_EPHEMERAL_PG_PORT)
    env["POSTGRES_PORT"] = str(_EPHEMERAL_PG_PORT)
    env["REDIS_HOST_PORT"] = str(_EPHEMERAL_REDIS_PORT)
    _run(["docker", "compose", "down", "-v"], env=env)
@pytest.fixture(scope="session", autouse=True)
 def _reset_database():
    """Truncate all application tables once per test session."""
    if _db_unavailable_reason:
        pytest.skip(_db_unavailable_reason, allow_module_level=True)
    async def _truncate() -> None:
        engine = create_async_engine(settings.DATABASE_URL)
        async with engine.begin() as conn:
-            await conn.execute(text(f"TRUNCATE TABLE {', '.join(TEST_TABLES)} CASCADE"))
+            await conn.execute(
                text(f"TRUNCATE TABLE {', '.join(TEST_TABLES)} CASCADE")
            )
        await engine.dispose()
    asyncio.run(_truncate())
    yield
@pytest.fixture(autouse=True)
 def _reset_rate_limiter():
    """Every TestClient request looks like the same client IP, so the
    per-IP auth limiter would trip mid-suite. Clear it between tests; the
    dedicated rate-limit test disables this to exercise the real behaviour.
    """
    from app import rate_limit
    rate_limit.reset_all()
    yield
@pytest.fixture(autouse=True)
 def _override_db():
    """Override get_db so the app uses a fresh session per test.
    Deliberately does NOT reuse app.database's shared engine: FastAPI's
    (sync) TestClient runs each request through anyio's blocking-portal
    machinery, which can hand different requests different event loops.
    asyncpg connections are bound to the loop they were created on, so
    reusing one from the shared pool across requests raises "attached to a
    different loop" the moment a test makes more than one request. NullPool
    sidesteps it: every checkout is a brand-new connection.
    """
    test_engine = create_async_engine(settings.DATABASE_URL, poolclass=NullPool)
    test_session_factory = async_sessionmaker(test_engine, expire_on_commit=False)
    async def _get_db():
        async_session = test_session_factory()
        try:
            yield async_session
            await async_session.commit()
        except Exception:
            await async_session.rollback()
            raise
        finally:
            await async_session.close()
    app.dependency_overrides[get_db] = _get_db
    yield
    app.dependency_overrides.clear()
@@ -1,105 +0,0 @@
 """Generates the golden-file chunk fixtures in this directory.
 These pin the world.md §3.6 binary format so the Python codec
 (app/services/chunk_codec.py) and any future Godot-side test fixture can be
 checked for drift (world_persistence_impl.md §5.5's "drift control"
 requirement). No Godot-side golden fixture existed at the time this was
 written (searched scripts/ and tests/ for AGPC / binary-format test
 vectors -- none found), so these are authored here, from this
 implementation, as the first golden files for the format. The client/editor
 follow-on task should decode these same files with
 `ChunkDataDecoder.decode_binary()` and assert the same logical values
 (see the note in chunk_codec.py about a confirmed float32 handling bug in
 that decoder that will need fixing for full byte parity on non-integer
 transforms).
 Run with: `python tests/fixtures/chunks/generate_fixtures.py` from `backend/`.
 Fixtures are checked in; this script is for regenerating them if the format
 or these examples change, not run as part of the test suite.
 """
 import sys
 from pathlib import Path
 sys.path.insert(0, str(Path(__file__).resolve().parents[3]))  # backend/
 from app.services import chunk_codec as cc
 FIXTURES_DIR = Path(__file__).resolve().parent
 def _empty_chunk() -> cc.ChunkPayload:
    return cc.ChunkPayload(
        world_id="7", room_id="main", coord=(0, 0, 0),
        bounds=cc.ChunkBounds(min=(0.0, 0.0, 0.0), size=(32.0, 32.0, 1.0)),
        tile_layers=[], objects=[],
        flags=cc.ContentFlags(),
        created_at=1_700_000_000, updated_at=1_700_000_000, revision=1, author="fixture-gen",
    )
 def _simple_tile_chunk() -> cc.ChunkPayload:
    layer = cc.TileLayer(
        name="ground", layer_id=0, width=4, height=4, depth=1,
        palette=[
            cc.TileDef(id=0, asset_id="", solid=False, flags=0, variants=1),
            cc.TileDef(id=1, asset_id="tiles/grass", solid=False, flags=1, variants=4),
            cc.TileDef(id=2, asset_id="tiles/stone", solid=True, flags=2, variants=2),
        ],
        tiles=[0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1, 0, 1, 1, 0],
    )
    return cc.ChunkPayload(
        world_id="12", room_id="main", coord=(3, -1, 0),
        bounds=cc.ChunkBounds(min=(96.0, -32.0, 0.0), size=(32.0, 32.0, 1.0)),
        tile_layers=[layer], objects=[],
        flags=cc.ContentFlags(violence=0, mature=False, sources=[]),
        created_at=1_700_000_000, updated_at=1_700_000_500, revision=2, author="fixture-gen",
    )
 def _chunk_with_objects() -> cc.ChunkPayload:
    layer = cc.TileLayer(
        name="ground", layer_id=0, width=2, height=2, depth=1,
        palette=[cc.TileDef(id=0, asset_id="", solid=False, flags=0, variants=1)],
        tiles=[0, 0, 0, 0],
    )
    obj1 = cc.WorldObject(
        id="obj_0001", type="interactable", asset_id="props/chest",
        pos=(101.5, -110.25, 0.5), rot=(0.0, 0.0, 0.0, 1.0), scale=(1.0, 1.0, 1.0),
        dynamic=False,
        properties={"locked": False, "loot_table": "chest_basic"},
        flags=cc.ContentFlags(violence=0, mature=False, sources=[]),
    )
    obj2 = cc.WorldObject(
        id="obj_0002", type="spawn_point", asset_id="",
        pos=(96.0, -128.0, 1.0), rot=(0.0, 0.7071, 0.0, 0.7071), scale=(1.0, 1.0, 1.0),
        dynamic=True,
        properties={},
        flags=cc.ContentFlags(violence=1, mature=False, sources=["asset:props/chest"]),
    )
    return cc.ChunkPayload(
        world_id="12", room_id="main", coord=(3, -4, 0),
        bounds=cc.ChunkBounds(min=(96.0, -128.0, 0.0), size=(32.0, 32.0, 1.0)),
        tile_layers=[layer], objects=[obj1, obj2],
        flags=cc.ContentFlags(violence=1, mature=False, sources=["asset:props/chest"]),
        created_at=1_700_000_000, updated_at=1_700_001_000, revision=5, author="agent-bot",
    )
 FIXTURES = {
    "empty_chunk.bin": _empty_chunk,
    "simple_tile_chunk.bin": _simple_tile_chunk,
    "chunk_with_objects.bin": _chunk_with_objects,
 }
 def main() -> None:
    for filename, builder in FIXTURES.items():
        payload = builder()
        data = cc.encode_binary(payload)
        (FIXTURES_DIR / filename).write_bytes(data)
        print(f"wrote {filename} ({len(data)} bytes)")
 if __name__ == "__main__":
    main()
@@ -3,102 +3,92 @@
 from datetime import date, timedelta
 import pytest
 from fastapi.testclient import TestClient
-from app.main import app
+from app.routers.auth import calculate_age
 from app.routers.auth import calculate_age, MIN_AGE, RegisterRequest
 class TestCalculateAge:
    """Unit tests for the calculate_age helper."""
    def test_exactly_18(self):
-        today = date(2026, 6, 15)
+        """A person born exactly 18 years ago today is 18."""
        today = date(2025, 6, 15)
        dob = today.replace(year=today.year - 18)
        assert calculate_age(dob, today=today) == 18
    def test_just_turned_18(self):
-        today = date(2026, 6, 15)
+        """A person who turned 18 yesterday is 18."""
        today = date(2025, 6, 15)
        dob = today.replace(year=today.year - 18) - timedelta(days=1)
        assert calculate_age(dob, today=today) == 18
    def test_one_day_short_of_18(self):
-        today = date(2026, 6, 15)
+        """A person born one day after their 18th birthday is 17."""
        today = date(2025, 6, 15)
        dob = today.replace(year=today.year - 18) + timedelta(days=1)
        assert calculate_age(dob, today=today) == 17
-    def test_leap_day_birthday_before(self):
+    def test_17_years_old(self):
-        assert calculate_age(date(2000, 2, 29), today=date(2024, 2, 28)) == 23
+        """A person who is 17 years old today is 17."""
        today = date(2025, 6, 15)
        dob = date(2008, 6, 15)
        assert calculate_age(dob, today=today) == 17
-    def test_leap_day_birthday_after(self):
+    def test_65_years_old(self):
-        assert calculate_age(date(2000, 2, 29), today=date(2024, 3, 1)) == 24
+        """A person who is 65 is correctly calculated."""
        today = date(2025, 6, 15)
        dob = today.replace(year=today.year - 65)
        assert calculate_age(dob, today=today) == 65
    def test_newborn(self):
        """A newborn is 0."""
        today = date(2025, 6, 15)
        dob = today
        assert calculate_age(dob, today=today) == 0
    def test_birthday_not_yet_this_year(self):
        """Person born Dec 31, 2000 — on Jan 1, 2025 they are still 24."""
        dob = date(2000, 12, 31)
        assert calculate_age(dob, today=date(2025, 1, 1)) == 24
    def test_birthday_today(self):
        """Person born Dec 31, 2000 — on Dec 31, 2024 they turn 24."""
        dob = date(2000, 12, 31)
        assert calculate_age(dob, today=date(2024, 12, 31)) == 24
-class TestRegisterRequestDob:
+class TestRegisterRequestOver18Field:
-    def test_dob_parsed_from_iso_string(self):
+    """Tests for RegisterRequest's over_18 field.
        req = RegisterRequest(username="u", email="u@example.com", password="p",
                              date_of_birth="1990-01-01")
        assert req.date_of_birth == date(1990, 1, 1)
-    def test_dob_required(self):
+    Replaces TestRegisterRequestDateValidation -- date_of_birth and its
-        with pytest.raises(Exception):
+    field_validator were removed from RegisterRequest 2026-08-20 (interim
    simplification: a plain client-side over_18 confirmation instead of
    collecting/validating an actual date of birth; see calculate_age's
    own docstring in app/routers/auth.py for why that function is still
    here even though this endpoint no longer calls it). There's no date
    format left to validate, so the equivalent coverage is just: the
    field exists, is a real bool, and is required."""
    def test_over_18_true_accepted(self):
        from app.routers.auth import RegisterRequest
        req = RegisterRequest(username="u", email="u@example.com", password="p", over_18=True)
        assert req.over_18 is True
    def test_over_18_false_accepted(self):
        """False is a valid value at the schema level -- the endpoint,
        not the schema, is what rejects it (see
        TestRegister::test_register_rejects_not_over_18 in
        test_auth_endpoints.py)."""
        from app.routers.auth import RegisterRequest
        req = RegisterRequest(username="u", email="u@example.com", password="p", over_18=False)
        assert req.over_18 is False
    def test_over_18_missing_rejected(self):
        """over_18 has no default -- omitting it entirely is a validation error."""
        from app.routers.auth import RegisterRequest
        from pydantic import ValidationError
        with pytest.raises(ValidationError):
            RegisterRequest(username="u", email="u@example.com", password="p")
    def test_bad_dob_string_rejected(self):
        with pytest.raises(Exception):
            RegisterRequest(username="u", email="u@example.com", password="p",
                            date_of_birth="not-a-date")
 class TestRegisterAgeGate:
    """End-to-end: the /register endpoint computes age from the DOB."""
    def _dob_for_age(self, years: int) -> str:
        return (date.today().replace(year=date.today().year - years)).isoformat()
    def test_adult_accepted(self):
        client = TestClient(app)
        r = client.post("/api/auth/register", json={
            "username": "gate_adult", "email": "gate_adult@e.com",
            "password": "secret123", "date_of_birth": self._dob_for_age(25),
        })
        assert r.status_code == 201, r.text
    def test_minor_rejected(self):
        client = TestClient(app)
        r = client.post("/api/auth/register", json={
            "username": "gate_minor", "email": "gate_minor@e.com",
            "password": "secret123", "date_of_birth": self._dob_for_age(15),
        })
        assert r.status_code == 403
        assert str(MIN_AGE) in r.json()["detail"]
    def test_exactly_18_accepted(self):
        client = TestClient(app)
        r = client.post("/api/auth/register", json={
            "username": "gate_18", "email": "gate_18@e.com",
            "password": "secret123",
            "date_of_birth": (date.today().replace(year=date.today().year - 18) - timedelta(days=1)).isoformat(),
        })
        assert r.status_code == 201, r.text
    def test_future_dob_rejected(self):
        client = TestClient(app)
        r = client.post("/api/auth/register", json={
            "username": "gate_future", "email": "gate_future@e.com",
            "password": "secret123", "date_of_birth": "2999-01-01",
        })
        assert r.status_code == 400
    def test_dob_is_stored(self):
        client = TestClient(app)
        dob = self._dob_for_age(30)
        reg = client.post("/api/auth/register", json={
            "username": "gate_stored", "email": "gate_stored@e.com",
            "password": "secret123", "date_of_birth": dob,
        })
        assert reg.status_code == 201
        me = client.get("/api/auth/me", headers={
            "Authorization": f"Bearer {reg.json()['access_token']}"
        })
        assert me.json()["date_of_birth"] == dob
@@ -73,7 +73,7 @@ class TestRegister:
                "username": "newuser",
                "email": "new@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        assert resp.status_code == 201
@@ -81,23 +81,26 @@ class TestRegister:
        assert "access_token" in data
        assert data["token_type"] == "bearer"
-    def test_register_rejects_under_18(self):
+    def test_register_rejects_not_over_18(self):
-        """A DOB that computes to under 18 gets a 403 (see test_auth_age_gate
+        """over_18=false gets a 400 with a detail message.
-        for the age-math coverage)."""
+
-        from datetime import date
+        The interim design (2026-08-20) trusts a client-side boolean
        confirmation instead of collecting/validating an actual date of
        birth -- this only checks that the flag is respected, not real
        age math (there's no date to verify against anymore). Real DOB
        collection/verification may come back in a future pass."""
        client = TestClient(app)
        minor_dob = date.today().replace(year=date.today().year - 14).isoformat()
        resp = client.post(
            "/api/auth/register",
            json={
                "username": "kid",
                "email": "kid@example.com",
                "password": "secret123",
-                "date_of_birth": minor_dob,
+                "over_18": False,
            },
        )
-        assert resp.status_code == 403
+        assert resp.status_code == 400
-        assert "at least 18" in resp.json()["detail"]
+        assert "18 or older" in resp.json()["detail"]
    def test_register_rejects_duplicate_username(self):
        """Registering the same username twice returns 409."""
@@ -109,7 +112,7 @@ class TestRegister:
                "username": "duplicate",
                "email": "dup1@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        # Second registration with same username, different email
@@ -119,7 +122,7 @@ class TestRegister:
                "username": "duplicate",
                "email": "dup2@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        assert resp.status_code == 409
@@ -134,7 +137,7 @@ class TestRegister:
                "username": "user1",
                "email": "same@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        resp = client.post(
@@ -143,14 +146,19 @@ class TestRegister:
                "username": "user2",
                "email": "same@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        assert resp.status_code == 409
        assert "Email already registered" in resp.json()["detail"]
-    def test_register_missing_dob(self):
+    def test_register_missing_over_18(self):
-        """Missing the required date_of_birth field returns 422."""
+        """Missing the required over_18 field returns 422.
        Replaces the old test_register_invalid_date_format -- there's no
        date format to get wrong anymore (no date field at all), so the
        closest equivalent "malformed request" case is the required
        over_18 boolean being absent entirely."""
        client = TestClient(app)
        resp = client.post(
            "/api/auth/register",
@@ -181,7 +189,7 @@ class TestLogin:
                "username": username,
                "email": email,
                "password": password,
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        assert resp.status_code == 201
@@ -93,7 +93,7 @@ def _register_user(client: TestClient, username: str) -> str:
            "username": username,
            "email": f"{username}@example.com",
            "password": "secret123",
-            "date_of_birth": "1990-01-01",
+            "over_18": True,
        },
    )
    assert resp.status_code == 201
@@ -1,91 +0,0 @@
 """Integration tests for GET/PUT /api/avatar/loadout.
 Hits the real app against the configured Postgres (same contract as the
 other integration tests -- migrations applied first).
 """
 import pytest
 from fastapi.testclient import TestClient
 from app.main import app
 from app.models.avatar_loadout import DEFAULT_LOADOUT
 def _auth_headers(client: TestClient, username: str) -> dict:
    resp = client.post(
        "/api/auth/register",
        json={
            "username": username,
            "email": f"{username}@example.com",
            "password": "secret123",
            "date_of_birth": "1990-01-01",
        },
    )
    assert resp.status_code == 201, resp.text
    return {"Authorization": f"Bearer {resp.json()['access_token']}"}
 class TestGetLoadout:
    def test_new_user_gets_the_default(self):
        client = TestClient(app)
        headers = _auth_headers(client, "av_default")
        resp = client.get("/api/avatar/loadout", headers=headers)
        assert resp.status_code == 200
        body = resp.json()
        assert body["is_default"] is True
        assert body["data"] == DEFAULT_LOADOUT
    def test_requires_auth(self):
        client = TestClient(app)
        assert client.get("/api/avatar/loadout").status_code == 401
 class TestPutLoadout:
    def test_save_then_read_back(self):
        client = TestClient(app)
        headers = _auth_headers(client, "av_save")
        loadout = {
            "base_body": "base_human_male_01",
            "slots": {"hair": "hair_mohawk_01", "accessory": ["accessory_belt_01"]},
            "skin_tone": {"r": 0.8, "g": 0.6, "b": 0.5, "a": 1.0},
        }
        put = client.put("/api/avatar/loadout", headers=headers, json={"data": loadout})
        assert put.status_code == 200, put.text
        assert put.json()["is_default"] is False
        got = client.get("/api/avatar/loadout", headers=headers)
        assert got.status_code == 200
        assert got.json()["is_default"] is False
        assert got.json()["data"] == loadout
    def test_put_is_idempotent_replace(self):
        client = TestClient(app)
        headers = _auth_headers(client, "av_replace")
        client.put(
            "/api/avatar/loadout", headers=headers,
            json={"data": {"base_body": "base_human_male_01", "slots": {"hair": "hair_mohawk_01"}}},
        )
        second = {"base_body": "base_human_male_01", "slots": {"chest": "chest_bandit_01"}}
        client.put("/api/avatar/loadout", headers=headers, json={"data": second})
        got = client.get("/api/avatar/loadout", headers=headers)
        assert got.json()["data"] == second
    def test_rejects_missing_base_body(self):
        client = TestClient(app)
        headers = _auth_headers(client, "av_nobase")
        resp = client.put("/api/avatar/loadout", headers=headers, json={"data": {"slots": {}}})
        assert resp.status_code == 422
    def test_rejects_non_object_slots(self):
        client = TestClient(app)
        headers = _auth_headers(client, "av_badslots")
        resp = client.put(
            "/api/avatar/loadout", headers=headers,
            json={"data": {"base_body": "base_human_male_01", "slots": "nope"}},
        )
        assert resp.status_code == 422
    def test_requires_auth(self):
        client = TestClient(app)
        resp = client.put("/api/avatar/loadout", json={"data": {"base_body": "x", "slots": {}}})
        assert resp.status_code == 401
@@ -1,219 +0,0 @@
 """Tests for app.services.chunk_codec -- the Python port of world.md §3.6.
 Pure unit tests: no database, no app, no network. Golden fixtures live in
 tests/fixtures/chunks/ (see generate_fixtures.py there for how/why).
 """
 from pathlib import Path
 import pytest
 from app.services import chunk_codec as cc
 FIXTURES_DIR = Path(__file__).resolve().parent / "fixtures" / "chunks"
 def _read_fixture(name: str) -> bytes:
    return (FIXTURES_DIR / name).read_bytes()
 class TestGoldenFixtures:
    """Byte-stability: decode a committed fixture, re-encode it, and the
    bytes must match exactly (world.md §3.6.3)."""
    @pytest.mark.parametrize("filename", [
        "empty_chunk.bin", "simple_tile_chunk.bin", "chunk_with_objects.bin",
    ])
    def test_round_trip_is_byte_identical(self, filename):
        original = _read_fixture(filename)
        decoded = cc.decode_binary(original)
        re_encoded = cc.encode_binary(decoded)
        assert re_encoded == original
    def test_simple_tile_chunk_logical_values(self):
        decoded = cc.decode_binary(_read_fixture("simple_tile_chunk.bin"))
        assert decoded.world_id == "12"
        assert decoded.room_id == "main"
        assert decoded.coord == (3, -1, 0)
        assert decoded.bounds.min == (96.0, -32.0, 0.0)
        assert decoded.bounds.size == (32.0, 32.0, 1.0)
        assert len(decoded.tile_layers) == 1
        layer = decoded.tile_layers[0]
        assert layer.name == "ground"
        assert (layer.width, layer.height, layer.depth) == (4, 4, 1)
        assert len(layer.palette) == 3
        assert layer.tiles == [0, 1, 1, 0, 1, 2, 2, 1, 1, 2, 2, 1, 0, 1, 1, 0]
        assert decoded.revision == 2
        assert decoded.author == "fixture-gen"
    def test_chunk_with_objects_logical_values(self):
        decoded = cc.decode_binary(_read_fixture("chunk_with_objects.bin"))
        assert len(decoded.objects) == 2
        obj1, obj2 = decoded.objects
        assert obj1.id == "obj_0001"
        assert obj1.type == "interactable"
        assert obj1.pos == (101.5, -110.25, 0.5)
        assert obj1.properties == {"locked": False, "loot_table": "chest_basic"}
        assert obj2.id == "obj_0002"
        assert obj2.dynamic is True
        assert obj2.flags.violence == 1
        assert obj2.flags.sources == ["asset:props/chest"]
        assert decoded.flags.violence == 1
        assert decoded.flags.sources == ["asset:props/chest"]
    def test_empty_chunk_has_no_layers_or_objects(self):
        decoded = cc.decode_binary(_read_fixture("empty_chunk.bin"))
        assert decoded.tile_layers == []
        assert decoded.objects == []
 class TestChecksum:
    def test_checksum_is_sha256_hex(self):
        import hashlib
        assert cc.checksum(b"") == hashlib.sha256(b"").hexdigest()
        assert len(cc.checksum(b"")) == 64
    def test_header_checksum_matches_recomputed_for_valid_fixture(self):
        data = _read_fixture("simple_tile_chunk.bin")
        header_checksum_hex = data[16:48].hex()
        body = data[cc.HEADER_SIZE:]
        assert header_checksum_hex == cc.checksum(body)
 class TestBuildKey:
    def test_matches_world_persistence_impl_4_5_format(self):
        assert cc.build_key(12, "main", 3, -1, 0) == "12:main:3:-1:0"
        assert cc.build_key("12", "main", 3, -1, 0) == "12:main:3:-1:0"
 class TestFloat32Fidelity:
    """This is the concrete regression test for the cross-codec divergence
    documented at the bottom of chunk_codec.py: this module must encode
    real IEEE-754 float32, including fractional and negative values,
    round-tripping exactly (up to float32 precision) -- unlike
    scripts/chunk_data_decoder.gd's current int-truncating implementation."""
    def test_fractional_and_negative_floats_survive_round_trip(self):
        payload = cc.ChunkPayload(
            world_id="1", room_id="main", coord=(0, 0, 0),
            bounds=cc.ChunkBounds(min=(-17.25, 0.125, -3.0), size=(32.0, 32.0, 1.0)),
            objects=[cc.WorldObject(
                id="o1", type="prop", asset_id="a",
                pos=(1.5, -2.75, 0.001), rot=(0.0, 0.7071068, 0.0, 0.7071068),
                scale=(1.0, 1.0, 1.0),
            )],
        )
        encoded = cc.encode_binary(payload)
        decoded = cc.decode_binary(encoded)
        assert decoded.bounds.min == pytest.approx((-17.25, 0.125, -3.0), abs=1e-6)
        assert decoded.objects[0].pos == pytest.approx((1.5, -2.75, 0.001), abs=1e-6)
        assert decoded.objects[0].rot == pytest.approx(
            (0.0, 0.7071068, 0.0, 0.7071068), abs=1e-6
        )
 class TestMalformedInput:
    def test_bad_magic_raises_codec_error(self):
        data = bytearray(_read_fixture("empty_chunk.bin"))
        data[0:4] = b"XXXX"
        with pytest.raises(cc.ChunkCodecError):
            cc.decode_binary(bytes(data))
    def test_too_short_raises_codec_error(self):
        with pytest.raises(cc.ChunkCodecError):
            cc.decode_binary(b"AGPC\x01\x00")
    def test_unsupported_version_raises_codec_error(self):
        data = bytearray(_read_fixture("empty_chunk.bin"))
        data[4:6] = (99).to_bytes(2, "little")
        with pytest.raises(cc.ChunkCodecError):
            cc.decode_binary(bytes(data))
    def test_payload_len_mismatch_raises_codec_error(self):
        data = bytearray(_read_fixture("empty_chunk.bin"))
        # Corrupt the declared payload_len (offset 12..16).
        data[12:16] = (99999).to_bytes(4, "little")
        with pytest.raises(cc.ChunkCodecError):
            cc.decode_binary(bytes(data))
 class TestValidation:
    """decode_and_validate: the server-side "don't trust the client"
    boundary (world_persistence_impl.md §5.5)."""
    def _valid_args(self):
        return {
            "expected_key": "12:main:3:-1:0",
            "grid_size": (4, 4, 1),
            "max_objects": 512,
        }
    def test_valid_payload_passes(self):
        data = _read_fixture("simple_tile_chunk.bin")
        payload = cc.decode_and_validate(data, **self._valid_args())
        assert payload.coord == (3, -1, 0)
    def test_checksum_mismatch_detected(self):
        data = bytearray(_read_fixture("simple_tile_chunk.bin"))
        # Corrupt one byte of the header's advisory checksum field
        # (offset 16..48) only -- magic/version/payload_len and the whole
        # payload body stay untouched, so this exercises exactly the
        # "recomputed checksum disagrees with the header" path rather than
        # also breaking structural decoding.
        data[16] ^= 0xFF
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(bytes(data), **self._valid_args())
        assert exc_info.value.reason == "checksum_mismatch"
    def test_chunk_key_mismatch_detected(self):
        data = _read_fixture("simple_tile_chunk.bin")
        args = self._valid_args()
        args["expected_key"] = "12:main:99:99:0"  # doesn't match the payload's own coord
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(data, **args)
        assert exc_info.value.reason == "chunk_key_mismatch"
    def test_layer_dims_mismatch_detected(self):
        data = _read_fixture("simple_tile_chunk.bin")
        args = self._valid_args()
        args["grid_size"] = (8, 8, 1)  # fixture's layer is 4x4x1
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(data, **args)
        assert exc_info.value.reason == "layer_dims"
    def test_too_many_objects_detected(self):
        data = _read_fixture("chunk_with_objects.bin")  # has 2 objects
        args = self._valid_args()
        args["expected_key"] = "12:main:3:-4:0"
        args["grid_size"] = (2, 2, 1)
        args["max_objects"] = 1
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(data, **args)
        assert exc_info.value.reason == "too_many_objects"
    def test_object_out_of_bounds_detected(self):
        payload = cc.ChunkPayload(
            world_id="1", room_id="main", coord=(0, 0, 0),
            bounds=cc.ChunkBounds(min=(0.0, 0.0, 0.0), size=(32.0, 32.0, 1.0)),
            objects=[cc.WorldObject(id="o1", type="prop", asset_id="a", pos=(9999.0, 0.0, 0.0))],
        )
        data = cc.encode_binary(payload)
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(
                data, expected_key="1:main:0:0:0", grid_size=(32, 32, 1), max_objects=10
            )
        assert exc_info.value.reason == "object_out_of_bounds"
    def test_tile_out_of_palette_detected(self):
        layer = cc.TileLayer(
            name="ground", width=2, height=2, depth=1,
            palette=[cc.TileDef(id=1)],  # tile 5 below isn't in this palette
            tiles=[1, 5, 0, 1],
        )
        payload = cc.ChunkPayload(world_id="1", room_id="main", coord=(0, 0, 0), tile_layers=[layer])
        data = cc.encode_binary(payload)
        with pytest.raises(cc.ChunkValidationError) as exc_info:
            cc.decode_and_validate(
                data, expected_key="1:main:0:0:0", grid_size=(2, 2, 1), max_objects=10
            )
        assert exc_info.value.reason == "tile_out_of_palette"
@@ -1,153 +0,0 @@
 """Unit tests for the game_servers.py changes made for world persistence
 (world_persistence_impl.md §7.3/§7.4): per-spawn token validation, and the
 ``_await_ready`` replacement for the old, fail-open ``_await_port``.
 No real Godot process is spawned here (that stays a manual/checkpoint
 integration test, per test_world_join.py's docstring) -- these exercise
 ``GameServerSupervisor`` against a fake process object standing in for
 ``subprocess.Popen``.
 """
 import json
 import pytest
 from app.config import settings
 from app.services.game_servers import GameServerSupervisor, _WorldServer
 class _FakeProc:
    """Stands in for subprocess.Popen: only .poll() is needed by the code
    paths under test here."""
    def __init__(self, exited: bool = False):
        self._exited = exited
    def poll(self):
        return 0 if self._exited else None
    def terminate(self):
        self._exited = True
    def wait(self, timeout=None):
        return 0
    def kill(self):
        self._exited = True
 def _make_srv(tmp_path, token="secret", alive=True) -> _WorldServer:
    status_path = tmp_path / "status.json"
    return _WorldServer(
        world_id="7", port=27000, proc=_FakeProc(exited=not alive),
        status_path=status_path, token=token,
    )
 class TestValidateToken:
    def test_unknown_world_is_false(self):
        sup = GameServerSupervisor()
        assert sup.validate_token("no-such-world", "anything") is False
    def test_correct_token_is_true(self, tmp_path):
        sup = GameServerSupervisor()
        sup._servers["7"] = _make_srv(tmp_path, token="secret")
        assert sup.validate_token("7", "secret") is True
        # world_id is looked up as str(world_id), so an int works too --
        # this matters because the FastAPI path param is an int.
        assert sup.validate_token(7, "secret") is True
    def test_wrong_token_is_false(self, tmp_path):
        sup = GameServerSupervisor()
        sup._servers["7"] = _make_srv(tmp_path, token="secret")
        assert sup.validate_token("7", "wrong") is False
    def test_token_scoped_to_its_own_world_only(self, tmp_path):
        sup = GameServerSupervisor()
        sup._servers["7"] = _make_srv(tmp_path, token="secret")
        # Same token, different world_id -- must not authenticate (§7.3:
        # "a path whose world_id differs from the token's world is 403").
        assert sup.validate_token("8", "secret") is False
    def test_dead_server_token_is_false(self, tmp_path):
        sup = GameServerSupervisor()
        sup._servers["7"] = _make_srv(tmp_path, token="secret", alive=False)
        assert sup.validate_token("7", "secret") is False
    def test_reaping_invalidates_the_token(self, tmp_path):
        """§7.3: "dies with its process" -- once removed from _servers
        (what the reaper does), the same token no longer validates."""
        sup = GameServerSupervisor()
        sup._servers["7"] = _make_srv(tmp_path, token="secret")
        assert sup.validate_token("7", "secret") is True
        del sup._servers["7"]
        assert sup.validate_token("7", "secret") is False
 class TestAwaitReady:
    """Replaces the old _await_port, which (a) treated a bound UDP port as
    readiness even though content loading happens before create_server, and
    (b) failed open past its deadline with no error at all."""
    async def test_raises_timeout_error_when_never_ready(self, tmp_path, monkeypatch):
        monkeypatch.setattr(settings, "GAME_SERVER_READY_TIMEOUT_SECONDS", 0.3)
        sup = GameServerSupervisor()
        srv = _make_srv(tmp_path)  # status file never written
        with pytest.raises(TimeoutError):
            await sup._await_ready(srv)
    async def test_returns_once_status_file_reports_ready(self, tmp_path, monkeypatch):
        monkeypatch.setattr(settings, "GAME_SERVER_READY_TIMEOUT_SECONDS", 5.0)
        sup = GameServerSupervisor()
        srv = _make_srv(tmp_path)
        srv.status_path.write_text(json.dumps({"ready": True, "players": 0}))
        await sup._await_ready(srv)  # must not raise / must not hang
    async def test_ready_false_is_not_ready(self, tmp_path, monkeypatch):
        monkeypatch.setattr(settings, "GAME_SERVER_READY_TIMEOUT_SECONDS", 0.3)
        sup = GameServerSupervisor()
        srv = _make_srv(tmp_path)
        srv.status_path.write_text(json.dumps({"ready": False, "players": 0}))
        with pytest.raises(TimeoutError):
            await sup._await_ready(srv)
    async def test_raises_promptly_if_process_already_exited(self, tmp_path, monkeypatch):
        # A long deadline, but the process is already dead -- must not wait
        # out the full deadline (this is the "no crash restart mid-wait"
        # case: don't silently poll a corpse for 20s).
        monkeypatch.setattr(settings, "GAME_SERVER_READY_TIMEOUT_SECONDS", 20.0)
        sup = GameServerSupervisor()
        srv = _make_srv(tmp_path, alive=False)
        with pytest.raises(TimeoutError):
            await sup._await_ready(srv)
 class TestSpawnCommandLine:
    def test_spawn_includes_api_url_and_server_token(self, monkeypatch, tmp_path):
        """world_persistence_impl.md §7.2 step 1 / §7.4: `_spawn` must pass
        --api-url and --server-token on the command line."""
        sup = GameServerSupervisor()
        monkeypatch.setattr(sup, "_free_port", lambda: 27050)
        captured = {}
        class _Proc:
            def poll(self):
                return None
        def _fake_popen(cmd, **kwargs):
            captured["cmd"] = cmd
            return _Proc()
        monkeypatch.setattr(
            "app.services.game_servers.subprocess.Popen", _fake_popen
        )
        srv = sup._spawn("42")
        cmd = captured["cmd"]
        assert "--api-url" in cmd
        assert cmd[cmd.index("--api-url") + 1] == settings.GAME_SERVER_INTERNAL_API_URL
        assert "--server-token" in cmd
        token_in_cmd = cmd[cmd.index("--server-token") + 1]
        assert token_in_cmd == srv.token
        assert len(srv.token) > 20  # secrets.token_urlsafe(32) -- not a short/guessable value
@@ -1,221 +0,0 @@
 """Integration tests for the presence feature:
 - POST  /api/presence/heartbeat
 - GET   /api/presence/presence
 - PATCH /api/presence/status
 Hits the real app against the configured Postgres *and* a real Redis
 (conftest.py brings up an ephemeral instance of each when neither is
 already reachable) -- presence is fundamentally "does a TTL key exist in
 Redis", which isn't worth faking with a mock.
 Also covers the regression fixed in 47ab492 ("Fix StatusUpdate field
 annotation and is_online batch-call mismatch"): the router used to call
 ``PresenceStore.is_online(ids)`` with a *list* of ids and then evaluate
 ``uid in online_ids`` against the returned bool, which raised a TypeError
 on the first real multi-id batch call, and ``StatusUpdate.status_message``
 used the invalid annotation ``str | Field(...)``. Both are exercised below.
 """
 import asyncio
 import pytest
 from fastapi.testclient import TestClient
 from app.main import app
 from app.services.presence import PresenceStore
 def _register(client: TestClient, username: str) -> dict:
    resp = client.post(
        "/api/auth/register",
        json={
            "username": username,
            "email": f"{username}@example.com",
            "password": "secret123",
            "date_of_birth": "1990-01-01",
        },
    )
    assert resp.status_code == 201, resp.text
    token = resp.json()["access_token"]
    headers = {"Authorization": f"Bearer {token}"}
    me = client.get("/api/users/me", headers=headers)
    assert me.status_code == 200, me.text
    return {"headers": headers, "id": me.json()["id"]}
 class TestHeartbeat:
    def test_heartbeat_sets_online(self):
        client = TestClient(app)
        user = _register(client, "presence_hb1")
        resp = client.post("/api/presence/heartbeat", json={}, headers=user["headers"])
        assert resp.status_code == 200, resp.text
        assert resp.json() == {"status": "ok", "user_id": user["id"]}
        presence = client.get(
            "/api/presence/presence",
            params={"user_ids": str(user["id"])},
            headers=user["headers"],
        )
        assert presence.status_code == 200, presence.text
        body = presence.json()["users"]
        assert len(body) == 1
        assert body[0]["user_id"] == user["id"]
        assert body[0]["is_online"] is True
        assert body[0]["last_seen_at"] is not None
    def test_requires_auth(self):
        client = TestClient(app)
        resp = client.post("/api/presence/heartbeat", json={})
        assert resp.status_code == 401
    def test_never_seen_user_is_offline_with_null_last_seen(self):
        client = TestClient(app)
        user = _register(client, "presence_never_hb")
        presence = client.get(
            "/api/presence/presence",
            params={"user_ids": str(user["id"])},
            headers=user["headers"],
        )
        assert presence.status_code == 200
        body = presence.json()["users"][0]
        assert body["is_online"] is False
        assert body["last_seen_at"] is None
 class TestBatchPresence:
    """Covers the batch-call path fixed in 47ab492 (is_online_batch via MGET)."""
    def test_batch_query_mixes_online_offline_and_unknown_ids(self):
        client = TestClient(app)
        online_user = _register(client, "presence_batch_online")
        offline_user = _register(client, "presence_batch_offline")
        client.post("/api/presence/heartbeat", json={}, headers=online_user["headers"])
        unknown_id = max(online_user["id"], offline_user["id"]) + 999_999
        ids = f"{online_user['id']},{offline_user['id']},{unknown_id}"
        resp = client.get(
            "/api/presence/presence",
            params={"user_ids": ids},
            headers=online_user["headers"],
        )
        assert resp.status_code == 200, resp.text
        by_id = {u["user_id"]: u for u in resp.json()["users"]}
        # Unknown id is silently dropped (not in the DB), not a 500 or 404.
        assert unknown_id not in by_id
        assert by_id[online_user["id"]]["is_online"] is True
        assert by_id[offline_user["id"]]["is_online"] is False
    def test_empty_user_ids_is_a_400(self):
        client = TestClient(app)
        user = _register(client, "presence_empty_ids")
        resp = client.get(
            "/api/presence/presence",
            params={"user_ids": ""},
            headers=user["headers"],
        )
        assert resp.status_code == 400
 class TestStatusMessage:
    def test_update_and_read_back_status_message(self):
        client = TestClient(app)
        user = _register(client, "presence_status1")
        resp = client.patch(
            "/api/presence/status",
            json={"status_message": "  brb, making coffee  "},
            headers=user["headers"],
        )
        assert resp.status_code == 200, resp.text
        # The router strips whitespace (StatusUpdate.strip_message).
        assert resp.json()["status_message"] == "brb, making coffee"
        presence = client.get(
            "/api/presence/presence",
            params={"user_ids": str(user["id"])},
            headers=user["headers"],
        )
        assert presence.json()["users"][0]["status_message"] == "brb, making coffee"
    def test_status_message_over_max_length_is_rejected(self):
        client = TestClient(app)
        user = _register(client, "presence_status_toolong")
        resp = client.patch(
            "/api/presence/status",
            json={"status_message": "x" * 141},
            headers=user["headers"],
        )
        # StatusUpdate.status_message: str | None = Field(..., max_length=140)
        # This is exactly the annotation 47ab492 fixed (it used to be the
        # invalid `str | Field(...)`, which breaks model construction
        # entirely rather than validating length).
        assert resp.status_code == 422
    def test_status_message_at_max_length_is_accepted(self):
        client = TestClient(app)
        user = _register(client, "presence_status_maxlen")
        resp = client.patch(
            "/api/presence/status",
            json={"status_message": "x" * 140},
            headers=user["headers"],
        )
        assert resp.status_code == 200, resp.text
    def test_null_status_message_clears_it(self):
        client = TestClient(app)
        user = _register(client, "presence_status_clear")
        client.patch("/api/presence/status", json={"status_message": "hi"}, headers=user["headers"])
        resp = client.patch("/api/presence/status", json={"status_message": None}, headers=user["headers"])
        assert resp.status_code == 200
        assert resp.json()["status_message"] is None
 class TestPresenceStoreTTL:
    """Exercises the real Redis TTL semantics directly against the service,
    with a short heartbeat_ttl so the test doesn't need to sleep for the
    real 60s default used in production. This is the cheap, real proxy for
    "TTL expiry means offline" the task asked for -- same code path
    (real Redis SET ... EX / EXISTS / MGET), just a much shorter window.
    """
    async def test_ttl_expiry_flips_online_to_offline(self):
        store = PresenceStore(heartbeat_ttl=1)
        try:
            uid = 987654321  # doesn't need to exist in Postgres; Redis-only check
            assert await store.is_online(uid) is False
            await store.heartbeat(uid)
            assert await store.is_online(uid) is True
            await asyncio.sleep(1.5)
            assert await store.is_online(uid) is False
        finally:
            await store.close()
    async def test_is_online_batch_matches_is_online_semantics(self):
        """Regression coverage for 47ab492: is_online_batch must return a
        set of ids usable with `in`, not a bool."""
        store = PresenceStore(heartbeat_ttl=30)
        try:
            online_uid, offline_uid = 111222333, 444555666
            await store.heartbeat(online_uid)
            result = await store.is_online_batch([online_uid, offline_uid])
            assert isinstance(result, set)
            assert online_uid in result
            assert offline_uid not in result
        finally:
            await store.close()
    async def test_is_online_batch_empty_list(self):
        store = PresenceStore()
        try:
            assert await store.is_online_batch([]) == set()
        finally:
            await store.close()
@@ -1,56 +0,0 @@
 """The auth endpoints are rate-limited per client IP."""
 import pytest
 from fastapi.testclient import TestClient
 from app import rate_limit
 from app.config import settings
 from app.main import app
@pytest.fixture(autouse=True)
 def _clean_limiter():
    # This module tests the limiter itself: force it on (the checkpoint
    # runner disables it suite-wide via RATE_LIMIT_ENABLED) and start each
    # test from an empty window.
    prev = settings.RATE_LIMIT_ENABLED
    settings.RATE_LIMIT_ENABLED = True
    rate_limit.reset_all()
    yield
    rate_limit.reset_all()
    settings.RATE_LIMIT_ENABLED = prev
 def test_login_is_limited_after_the_threshold():
    client = TestClient(app)
    codes = []
    for i in range(15):
        r = client.post("/api/auth/login", data={"username": f"nobody{i}", "password": "x"})
        codes.append(r.status_code)
    # First 10 get through to the (failing) auth check; the rest are 429.
    assert codes[:10] == [401] * 10
    assert 429 in codes[10:]
    assert codes[-1] == 429
 def test_register_shares_the_same_bucket():
    client = TestClient(app)
    # Burn the budget on login...
    for i in range(10):
        client.post("/api/auth/login", data={"username": f"x{i}", "password": "y"})
    # ...register from the same IP is now blocked too.
    r = client.post("/api/auth/register", json={
        "username": "rl_user", "email": "rl@e.com",
        "password": "secret123", "date_of_birth": "1990-01-01",
    })
    assert r.status_code == 429
    assert "Retry-After" in r.headers
 def test_limiter_window_is_per_key():
    limiter = rate_limit.SlidingWindowLimiter(max_hits=2, window_seconds=60)
    limiter.check("a")
    limiter.check("a")
    with pytest.raises(Exception):
        limiter.check("a")
    limiter.check("b")  # different key, unaffected
@@ -59,7 +59,7 @@ class TestRefresh:
                "username": username,
                "email": email,
                "password": password,
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        assert resp.status_code == 201
@@ -143,7 +143,7 @@ class TestRefresh:
                "username": "refep_loginrefuser",
                "email": "loginref@example.com",
                "password": "secret123",
-                "date_of_birth": "1990-01-01",
+                "over_18": True,
            },
        )
        # Login to get a refresh token
@@ -1,240 +0,0 @@
 """Model-level tests for the social graph: friendships, follows, blocks.
 app/models/social.py / alembic/versions/0007_add_social_graph_tables.py
 (docs/planning/social.md US-1). This is the models+migration task only --
 there are no API endpoints yet (a sibling task owns the router), so these
 tests exercise the ORM models and the real Postgres constraints directly
 rather than going through HTTP.
 """
 import pytest
 from fastapi.testclient import TestClient
 from sqlalchemy import delete, select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.pool import NullPool
 from app.config import settings
 from app.main import app
 from app.models.social import Friendship, Follow, Block, FriendshipStatus
 from app.models.user import User
 def _register(client: TestClient, username: str) -> int:
    resp = client.post(
        "/api/auth/register",
        json={
            "username": username,
            "email": f"{username}@example.com",
            "password": "secret123",
            "date_of_birth": "1990-01-01",
        },
    )
    assert resp.status_code == 201, resp.text
    headers = {"Authorization": f"Bearer {resp.json()['access_token']}"}
    me = client.get("/api/users/me", headers=headers)
    assert me.status_code == 200, me.text
    return me.json()["id"]
 def _session_factory():
    engine = create_async_engine(settings.DATABASE_URL, poolclass=NullPool)
    return engine, async_sessionmaker(engine, expire_on_commit=False)
 class TestFriendshipRequestAccept:
    async def test_request_defaults_to_pending(self):
        client = TestClient(app)
        a = _register(client, "sg_fr_a1")
        b = _register(client, "sg_fr_b1")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                fr = Friendship(requester_id=a, addressee_id=b)
                session.add(fr)
                await session.commit()
                await session.refresh(fr)
                assert fr.status == FriendshipStatus.PENDING
                assert fr.requester_id == a
                assert fr.addressee_id == b
        finally:
            await engine.dispose()
    async def test_accept_updates_status(self):
        client = TestClient(app)
        a = _register(client, "sg_fr_a2")
        b = _register(client, "sg_fr_b2")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                fr = Friendship(requester_id=a, addressee_id=b)
                session.add(fr)
                await session.commit()
                fr_id = fr.id
            async with factory() as session:
                fr = await session.get(Friendship, fr_id)
                fr.status = FriendshipStatus.ACCEPTED
                await session.commit()
            async with factory() as session:
                fr = await session.get(Friendship, fr_id)
                assert fr.status == FriendshipStatus.ACCEPTED
        finally:
            await engine.dispose()
 class TestUniquePairConstraints:
    async def test_duplicate_friendship_pair_rejected(self):
        client = TestClient(app)
        a = _register(client, "sg_uq_fr_a")
        b = _register(client, "sg_uq_fr_b")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                session.add(Friendship(requester_id=a, addressee_id=b))
                await session.commit()
            async with factory() as session:
                session.add(Friendship(requester_id=a, addressee_id=b))
                with pytest.raises(IntegrityError):
                    await session.commit()
        finally:
            await engine.dispose()
    async def test_duplicate_follow_pair_rejected(self):
        client = TestClient(app)
        a = _register(client, "sg_uq_fw_a")
        b = _register(client, "sg_uq_fw_b")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                session.add(Follow(follower_id=a, followed_id=b))
                await session.commit()
            async with factory() as session:
                session.add(Follow(follower_id=a, followed_id=b))
                with pytest.raises(IntegrityError):
                    await session.commit()
        finally:
            await engine.dispose()
    async def test_duplicate_block_pair_rejected(self):
        client = TestClient(app)
        a = _register(client, "sg_uq_bl_a")
        b = _register(client, "sg_uq_bl_b")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                session.add(Block(blocker_id=a, blocked_id=b))
                await session.commit()
            async with factory() as session:
                session.add(Block(blocker_id=a, blocked_id=b))
                with pytest.raises(IntegrityError):
                    await session.commit()
        finally:
            await engine.dispose()
 class TestFollow:
    async def test_create_follow(self):
        client = TestClient(app)
        a = _register(client, "sg_follow_a")
        b = _register(client, "sg_follow_b")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                session.add(Follow(follower_id=a, followed_id=b))
                await session.commit()
            async with factory() as session:
                rows = (await session.execute(
                    select(Follow).where(Follow.follower_id == a, Follow.followed_id == b)
                )).scalars().all()
                assert len(rows) == 1
        finally:
            await engine.dispose()
 class TestBlock:
    async def test_create_block(self):
        client = TestClient(app)
        a = _register(client, "sg_block_a")
        b = _register(client, "sg_block_b")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                session.add(Block(blocker_id=a, blocked_id=b))
                await session.commit()
            async with factory() as session:
                rows = (await session.execute(
                    select(Block).where(Block.blocker_id == a, Block.blocked_id == b)
                )).scalars().all()
                assert len(rows) == 1
        finally:
            await engine.dispose()
 class TestCascadeDelete:
    async def test_deleting_user_removes_rows_in_all_three_tables(self):
        """Deleting a user removes friendships/follows/blocks referencing them
        in *either* FK column, via the real DB ON DELETE CASCADE (deleted with
        a Core statement, bypassing any ORM-level cascade, to prove the
        database constraint itself does the job)."""
        client = TestClient(app)
        a = _register(client, "sg_cascade_a")
        b = _register(client, "sg_cascade_b")
        c = _register(client, "sg_cascade_c")
        engine, factory = _session_factory()
        try:
            async with factory() as session:
                # a as requester/follower/blocker, and also as addressee (c -> a)
                session.add(Friendship(requester_id=a, addressee_id=b))
                session.add(Friendship(requester_id=c, addressee_id=a))
                session.add(Follow(follower_id=a, followed_id=b))
                session.add(Follow(follower_id=c, followed_id=a))
                session.add(Block(blocker_id=a, blocked_id=b))
                session.add(Block(blocker_id=c, blocked_id=a))
                await session.commit()
            async with factory() as session:
                await session.execute(delete(User).where(User.id == a))
                await session.commit()
            async with factory() as session:
                friendships = (await session.execute(
                    select(Friendship).where(
                        (Friendship.requester_id == a) | (Friendship.addressee_id == a)
                    )
                )).scalars().all()
                follows = (await session.execute(
                    select(Follow).where(
                        (Follow.follower_id == a) | (Follow.followed_id == a)
                    )
                )).scalars().all()
                blocks = (await session.execute(
                    select(Block).where(
                        (Block.blocker_id == a) | (Block.blocked_id == a)
                    )
                )).scalars().all()
                assert friendships == []
                assert follows == []
                assert blocks == []
                # Unrelated rows (b, c only) survive.
                remaining_users = (await session.execute(
                    select(User.id).where(User.id.in_([b, c]))
                )).scalars().all()
                assert set(remaining_users) == {b, c}
        finally:
            await engine.dispose()
@@ -1,490 +0,0 @@
 """Integration tests for the world content API: rooms + chunks.
 Covers docs/architecture/world_persistence_impl.md §8.1 (public router,
 app/routers/world_content.py) and §8.3 (internal router,
 app/routers/internal.py), plus the create_world -> auto "main" room
 behaviour (§4.1).
 Runs against the real ephemeral Postgres the hermetic conftest.py stands
 up -- these are full HTTP round trips through TestClient, not mocked.
 """
 import base64
 import pytest
 from fastapi.testclient import TestClient
 from app.main import app
 from app.services import chunk_codec as cc
 from app.services.game_servers import supervisor
 GRID_32 = (32, 32, 1)
 def _auth(client: TestClient, name: str) -> tuple[dict, int]:
    r = client.post("/api/auth/register", json={
        "username": name, "email": f"{name}@e.com", "password": "secret123",
        "date_of_birth": "1990-01-01",
    })
    assert r.status_code == 201, r.text
    headers = {"Authorization": f"Bearer {r.json()['access_token']}"}
    me = client.get("/api/users/me", headers=headers)
    return headers, me.json()["id"]
 def _make_world(client: TestClient, headers: dict, visibility: str = "public") -> int:
    r = client.post("/api/worlds/", headers=headers, json={"name": "W", "visibility": visibility})
    assert r.status_code == 201, r.text
    return r.json()["id"]
 def _build_chunk(world_id: int, slug: str, cx: int, cy: int, cz: int, *,
                  grid=GRID_32, revision: int = 1, extra_tag: str = "") -> bytes:
    """A small but structurally-real chunk payload for `world_id`/`slug`/coord,
    sized to match the room's default 32x32x1 grid."""
    w, h, d = grid
    layer = cc.TileLayer(
        name="ground", layer_id=0, width=w, height=h, depth=d,
        palette=[cc.TileDef(id=0, asset_id="", solid=False, flags=0, variants=1)],
        tiles=[0] * (w * h * d),
    )
    obj = cc.WorldObject(
        id=f"obj_{extra_tag or '1'}", type="prop", asset_id="props/rock",
        pos=(1.0, 1.0, 0.0), properties={"tag": extra_tag},
    )
    payload = cc.ChunkPayload(
        world_id=str(world_id), room_id=slug, coord=(cx, cy, cz),
        bounds=cc.ChunkBounds(min=(0.0, 0.0, 0.0), size=(float(w), float(h), float(d))),
        tile_layers=[layer], objects=[obj], revision=revision, author="pytest",
        created_at=1_700_000_000, updated_at=1_700_000_000,
    )
    return cc.encode_binary(payload)
 class TestCreateWorldMainRoom:
    def test_create_world_auto_creates_main_room(self):
        client = TestClient(app)
        headers, _ = _auth(client, "cw_main")
        wid = _make_world(client, headers)
        r = client.get(f"/api/worlds/{wid}/rooms", headers=headers)
        assert r.status_code == 200, r.text
        rooms = r.json()
        assert len(rooms) == 1
        assert rooms[0]["slug"] == "main"
        assert rooms[0]["name"] == "Main"
        assert rooms[0]["chunk_count"] == 0
        assert rooms[0]["grid"]["size"] == [32, 32, 1]
 class TestRoomAuth:
    def test_create_room_requires_owner(self):
        client = TestClient(app)
        owner_headers, _ = _auth(client, "room_owner")
        wid = _make_world(client, owner_headers)
        other_headers, _ = _auth(client, "room_other")
        r = client.post(f"/api/worlds/{wid}/rooms", headers=other_headers,
                         json={"slug": "annex", "name": "Annex"})
        assert r.status_code == 403
    def test_list_rooms_of_private_world_is_404_for_non_owner(self):
        client = TestClient(app)
        owner_headers, _ = _auth(client, "room_priv_owner")
        wid = _make_world(client, owner_headers, "private")
        other_headers, _ = _auth(client, "room_priv_other")
        r = client.get(f"/api/worlds/{wid}/rooms", headers=other_headers)
        assert r.status_code == 404
 class TestChunkPutGetRoundTrip:
    def test_binary_put_then_binary_get_round_trips(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_rt")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 0, 0, 0)
        r = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        assert r.status_code == 200, r.text
        body = r.json()
        assert body["revision"] == 1
        assert body["payload_len"] == len(payload)
        assert body["checksum"] == cc.checksum(payload[cc.HEADER_SIZE:])
        assert body["live_session"] is False
        g = client.get(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Accept": "application/octet-stream"},
        )
        assert g.status_code == 200
        assert g.content == payload
        assert g.headers["ETag"] == f'"{body["checksum"]}"'
        assert g.headers["X-Chunk-Revision"] == "1"
    def test_json_accept_returns_decoded_shape(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_json")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 1, 1, 0)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/1/1/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        g = client.get(
            f"/api/worlds/{wid}/rooms/main/chunks/1/1/0",
            headers={**headers, "Accept": "application/json"},
        )
        assert g.status_code == 200
        data = g.json()
        assert data["coord"] == {"cx": 1, "cy": 1, "cz": 0}
        assert data["world_id"] == str(wid)
        assert data["room_id"] == "main"
        assert len(data["objects"]) == 1
    def test_json_put_with_base64_payload(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_json_put")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 2, 2, 0)
        r = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/2/2/0", headers=headers,
            json={"base_revision": 0, "payload_b64": base64.b64encode(payload).decode()},
        )
        assert r.status_code == 200, r.text
        assert r.json()["revision"] == 1
    def test_if_none_match_returns_304(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_304")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 3, 3, 0)
        put = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/3/3/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        checksum = put.json()["checksum"]
        g = client.get(
            f"/api/worlds/{wid}/rooms/main/chunks/3/3/0",
            headers={**headers, "If-None-Match": f'"{checksum}"'},
        )
        assert g.status_code == 304
    def test_unwritten_coordinate_is_404(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_404")
        wid = _make_world(client, headers)
        g = client.get(f"/api/worlds/{wid}/rooms/main/chunks/9/9/0", headers=headers)
        assert g.status_code == 404
 class TestRevisionConflict:
    def test_create_conflict_when_chunk_already_exists(self):
        client = TestClient(app)
        headers, _ = _auth(client, "conflict_create")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 4, 4, 0)
        first = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/4/4/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        assert first.status_code == 200
        second = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/4/4/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        assert second.status_code == 409
        body = second.json()
        assert body["detail"] == "revision conflict"
        assert body["current_revision"] == 1
    def test_stale_base_revision_conflict_reports_current_state(self):
        client = TestClient(app)
        headers, _ = _auth(client, "conflict_stale")
        wid = _make_world(client, headers)
        payload_v1 = _build_chunk(wid, "main", 5, 5, 0, revision=1)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/5/5/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload_v1,
        )
        payload_v2 = _build_chunk(wid, "main", 5, 5, 0, revision=2, extra_tag="v2")
        r2 = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/5/5/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "1"},
            content=payload_v2,
        )
        assert r2.status_code == 200
        assert r2.json()["revision"] == 2
        # Now retry with the now-stale base_revision=1 again.
        payload_v3 = _build_chunk(wid, "main", 5, 5, 0, revision=3, extra_tag="v3")
        stale = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/5/5/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "1"},
            content=payload_v3,
        )
        assert stale.status_code == 409
        body = stale.json()
        assert body["current_revision"] == 2
        assert body["current_checksum"] == r2.json()["checksum"]
 class TestBatchWrite:
    def test_batch_put_all_succeed(self):
        client = TestClient(app)
        headers, _ = _auth(client, "batch_ok")
        wid = _make_world(client, headers)
        chunks = [
            {"cx": cx, "cy": 0, "cz": 0, "base_revision": 0,
             "payload_b64": base64.b64encode(_build_chunk(wid, "main", cx, 0, 0)).decode()}
            for cx in (10, 11)
        ]
        r = client.put(f"/api/worlds/{wid}/rooms/main/chunks", headers=headers, json={"chunks": chunks})
        assert r.status_code == 200, r.text
        body = r.json()
        assert len(body["chunks"]) == 2
        assert all(c["revision"] == 1 for c in body["chunks"])
        idx = client.get(f"/api/worlds/{wid}/rooms/main/chunks", headers=headers)
        keys = {c["key"] for c in idx.json()["chunks"]}
        assert f"{wid}:main:10:0:0" in keys
        assert f"{wid}:main:11:0:0" in keys
    def test_batch_put_is_all_or_nothing_on_conflict(self):
        client = TestClient(app)
        headers, _ = _auth(client, "batch_conflict")
        wid = _make_world(client, headers)
        # Pre-create one of the two coordinates so the batch's base_revision=0
        # for it will conflict.
        pre = _build_chunk(wid, "main", 20, 0, 0)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/20/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=pre,
        )
        chunks = [
            {"cx": 21, "cy": 0, "cz": 0, "base_revision": 0,
             "payload_b64": base64.b64encode(_build_chunk(wid, "main", 21, 0, 0)).decode()},
            {"cx": 20, "cy": 0, "cz": 0, "base_revision": 0,  # conflicts: already exists at revision 1
             "payload_b64": base64.b64encode(_build_chunk(wid, "main", 20, 0, 0, extra_tag="v2")).decode()},
        ]
        r = client.put(f"/api/worlds/{wid}/rooms/main/chunks", headers=headers, json={"chunks": chunks})
        assert r.status_code == 409
        # Nothing from this batch should have been persisted -- (21,0,0)
        # must NOT exist even though it was valid and came first.
        g = client.get(f"/api/worlds/{wid}/rooms/main/chunks/21/0/0", headers=headers)
        assert g.status_code == 404
 class TestDelete:
    def test_delete_then_get_is_404(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_delete")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 30, 0, 0)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/30/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        d = client.delete(f"/api/worlds/{wid}/rooms/main/chunks/30/0/0", headers=headers)
        assert d.status_code == 204
        g = client.get(f"/api/worlds/{wid}/rooms/main/chunks/30/0/0", headers=headers)
        assert g.status_code == 404
 class TestRevisionsAndRollback:
    def test_revisions_then_rollback(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_rollback")
        wid = _make_world(client, headers)
        v1 = _build_chunk(wid, "main", 40, 0, 0, revision=1)
        r1 = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/40/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=v1,
        )
        v2 = _build_chunk(wid, "main", 40, 0, 0, revision=2, extra_tag="v2")
        r2 = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/40/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "1"},
            content=v2,
        )
        assert r2.status_code == 200
        revs = client.get(f"/api/worlds/{wid}/rooms/main/chunks/40/0/0/revisions", headers=headers)
        assert revs.status_code == 200
        rev_numbers = [row["revision"] for row in revs.json()]
        assert 1 in rev_numbers and 2 in rev_numbers
        rb = client.post(
            f"/api/worlds/{wid}/rooms/main/chunks/40/0/0/rollback",
            headers=headers, json={"revision": 1},
        )
        assert rb.status_code == 200, rb.text
        assert rb.json()["revision"] == 3  # a new revision, restoring v1's content
        assert rb.json()["checksum"] == r1.json()["checksum"]
    def test_revisions_requires_owner(self):
        client = TestClient(app)
        owner_headers, _ = _auth(client, "revisions_owner")
        wid = _make_world(client, owner_headers)
        payload = _build_chunk(wid, "main", 41, 0, 0)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/41/0/0",
            headers={**owner_headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        other_headers, _ = _auth(client, "revisions_other")
        r = client.get(f"/api/worlds/{wid}/rooms/main/chunks/41/0/0/revisions", headers=other_headers)
        assert r.status_code == 403
 class TestValidationErrors:
    def test_malformed_payload_is_422(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_malformed")
        wid = _make_world(client, headers)
        r = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=b"not a real chunk",
        )
        assert r.status_code == 422
        assert r.json()["reason"] == "malformed"
    def test_wrong_grid_size_is_422_layer_dims(self):
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_layerdims")
        wid = _make_world(client, headers)
        # Room's default grid is 32x32x1; build a chunk sized for 4x4x1.
        payload = _build_chunk(wid, "main", 0, 0, 0, grid=(4, 4, 1))
        r = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        assert r.status_code == 422
        assert r.json()["reason"] == "layer_dims"
    def test_oversized_payload_is_413(self, monkeypatch):
        from app.config import settings
        monkeypatch.setattr(settings, "WORLD_CHUNK_MAX_PAYLOAD_BYTES", 10)
        client = TestClient(app)
        headers, _ = _auth(client, "chunk_413")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 0, 0, 0)
        r = client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        assert r.status_code == 413
 class TestInternalApi:
    """docs/architecture/world_persistence_impl.md §7/§8.3. No real Godot
    process is spawned in this test env (GAME_SERVERS_ENABLED=False); we
    register a fake in-memory server entry with a known token to exercise
    require_game_server without needing a live process."""
    @pytest.fixture
    def fake_server_token(self):
        # NB: a class body can't read a same-named local from the
        # enclosing function via `token = token` (class bodies use LOAD_NAME,
        # which skips enclosing function scopes) -- use a literal instead.
        world_id_str = "internal-test-world"
        class _FakeSrv:
            def alive(self_inner):
                return True
            token = "test-internal-token-12345"
        supervisor._servers[world_id_str] = _FakeSrv()
        yield _FakeSrv.token
        supervisor._servers.pop(world_id_str, None)
    def test_missing_token_is_401(self):
        client = TestClient(app)
        r = client.get("/api/internal/worlds/1/manifest")
        assert r.status_code == 401
    def test_wrong_token_is_403(self):
        client = TestClient(app)
        r = client.get(
            "/api/internal/worlds/1/manifest",
            headers={"Authorization": "Bearer not-the-real-token"},
        )
        assert r.status_code == 403
    def test_valid_token_but_wrong_world_id_is_403(self, fake_server_token):
        # The fake token is registered under world_id "internal-test-world";
        # a request for a different world_id must not authenticate.
        client = TestClient(app)
        r = client.get(
            "/api/internal/worlds/999999/manifest",
            headers={"Authorization": f"Bearer {fake_server_token}"},
        )
        assert r.status_code == 403
    def test_valid_token_reaches_manifest_for_real_world(self):
        client = TestClient(app)
        headers, _ = _auth(client, "internal_manifest")
        wid = _make_world(client, headers)
        class _FakeSrv:
            def alive(self_inner):
                return True
            token = "another-real-token"
        supervisor._servers[str(wid)] = _FakeSrv()
        try:
            r = client.get(
                f"/api/internal/worlds/{wid}/manifest",
                headers={"Authorization": "Bearer another-real-token"},
            )
            assert r.status_code == 200, r.text
            body = r.json()
            assert body["world_id"] == wid
            assert len(body["rooms"]) == 1
            assert body["rooms"][0]["slug"] == "main"
        finally:
            supervisor._servers.pop(str(wid), None)
    def test_internal_chunk_fetch_returns_binary(self):
        client = TestClient(app)
        headers, _ = _auth(client, "internal_chunk")
        wid = _make_world(client, headers)
        payload = _build_chunk(wid, "main", 0, 0, 0)
        client.put(
            f"/api/worlds/{wid}/rooms/main/chunks/0/0/0",
            headers={**headers, "Content-Type": "application/octet-stream", "X-Base-Revision": "0"},
            content=payload,
        )
        class _FakeSrv:
            def alive(self_inner):
                return True
            token = "internal-chunk-token"
        supervisor._servers[str(wid)] = _FakeSrv()
        try:
            r = client.get(
                f"/api/internal/worlds/{wid}/rooms/main/chunks/0/0/0",
                headers={"Authorization": "Bearer internal-chunk-token"},
            )
            assert r.status_code == 200
            assert r.content == payload
        finally:
            supervisor._servers.pop(str(wid), None)
@@ -1,54 +0,0 @@
 """Tests for POST /api/worlds/{id}/join.
 The happy path spawns a real Godot process, so it's covered by a manual /
 checkpoint integration test, not here. These cover the envelope: auth,
 visibility, and the 503 when orchestration is disabled (the default).
 """
 import pytest
 from fastapi.testclient import TestClient
 from app.main import app
 def _auth(client: TestClient, name: str) -> tuple[dict, int]:
    r = client.post("/api/auth/register", json={
        "username": name, "email": f"{name}@e.com", "password": "secret123", "date_of_birth": "1990-01-01",
    })
    assert r.status_code == 201, r.text
    headers = {"Authorization": f"Bearer {r.json()['access_token']}"}
    me = client.get("/api/users/me", headers=headers)
    return headers, me.json()["id"]
 def _make_world(client: TestClient, headers: dict, visibility: str = "public") -> int:
    r = client.post("/api/worlds/", headers=headers, json={"name": "W", "visibility": visibility})
    assert r.status_code == 201, r.text
    return r.json()["id"]
 class TestJoinWorld:
    def test_requires_auth(self):
        client = TestClient(app)
        assert client.post("/api/worlds/1/join").status_code == 401
    def test_unknown_world_is_404(self):
        client = TestClient(app)
        headers, _ = _auth(client, "join_404")
        assert client.post("/api/worlds/999999/join", headers=headers).status_code == 404
    def test_private_world_of_another_user_is_404(self):
        client = TestClient(app)
        owner_headers, _ = _auth(client, "join_owner")
        wid = _make_world(client, owner_headers, "private")
        other_headers, _ = _auth(client, "join_other")
        assert client.post(f"/api/worlds/{wid}/join", headers=other_headers).status_code == 404
    def test_disabled_orchestration_returns_503(self):
        # GAME_SERVERS_ENABLED defaults to False in tests.
        client = TestClient(app)
        headers, _ = _auth(client, "join_503")
        wid = _make_world(client, headers, "public")
        r = client.post(f"/api/worlds/{wid}/join", headers=headers)
        assert r.status_code == 503
        assert "not enabled" in r.json()["detail"]
@@ -449,37 +449,6 @@ The catalog is a JSON manifest mapping asset ids to metadata and resource paths:
 ---
 ## 9a. Loadout Persistence (implemented, PC3 Phase 1)
 **Storage.** One row per user in `avatar_loadouts` (`user_id` PK/FK,
 `data` JSONB, timestamps). The entire loadout is stored as a single JSON
 document in the exact shape the client's `AvatarLoadout.to_json()` emits
 (`{"base_body": str, "slots": {...}, "skin_tone"?: {r,g,b,a}}`) rather than
 exploded into columns.
 **Why one JSON blob, not columns.** The server has no copy of the asset
 catalog (`assets/avatars/catalog.json` ships with the client). It therefore
 cannot meaningfully validate *which* asset belongs in *which* slot, whether
 an asset exists, or slot-exclusivity rules — that validation stays on the
 client (`AvatarLoadout.validate()` against the loaded `AvatarCatalog`). The
 server enforces only the envelope: a JSON object with a non-empty string
 `base_body`, an object `slots`, and a sane size cap. Keeping the schema
 opaque to the server also means catalog/loadout-shape changes don't need a
 migration.
 **Endpoints** (`/api/avatar`, bearer auth):
 | Method | Path | Behaviour |
 |---|---|---|
 | `GET` | `/loadout` | The user's saved loadout, or the server default (`{"base_body": "base_human_male_01", "slots": {}}`, `is_default: true`) if they have never saved one. |
 | `PUT` | `/loadout` | Replace the user's loadout (full document, not a patch). |
 **Defaults.** A brand-new account has no row; `GET` returns
 `models.avatar_loadout.DEFAULT_LOADOUT` with `is_default: true` so the client
 can distinguish "never customised" from "customised back to the base look".
 ---
 ## 10. Summary
 | Concern                | Decision                                              |
@@ -227,33 +227,18 @@ An account has an **age verification status**:
 ### 5.2 Tier 1 — Self-Declaration Flow
 > **Implemented, PC3 Phase 3.** `POST /api/auth/register` now takes a real
 > `date_of_birth` (ISO `YYYY-MM-DD`), not the throwaway `over_18` boolean it
 > had before. The server computes age (`auth.calculate_age`) and rejects
 > anyone under `auth.MIN_AGE` (18) with a **403** — this platform is
 > adults-only, so there is no "minor, restricted" tier here (the 13+ rows
 > below are the general design, not the current gate). A future-in-the-past
 > or nonsensical date is a **400**. The DOB is stored on the user row and
 > surfaced only back to that user (`/api/auth/me`), never to other players.
 >
 > **Limitation, stated plainly:** this is still self-attested — a determined
 > user can enter a false DOB. It is a concrete, stored, legally-meaningful
 > data point (matching how most platforms gate before adding hard checks)
 > and the seam for Tier 2. Encryption-at-rest for the DOB column and the
 > Tier 2 ID-check hook below are **not yet implemented**.
 ```
 User submits { date_of_birth }
        │
        ▼
-Server validates format & plausibility (real date, not in future)
+Server validates format & plausibility (age 13–120, not in future)
        │
        ▼
 Compute age from DOB
        │
        ▼
-age >= 18 ──► status = self_declared (adult)   ← the current gate
+age >= 18 ──► status = self_declared (adult)
-age >= 13 ──► status = self_declared (minor, restricted)   ← design only
+age >= 13 ──► status = self_declared (minor, restricted)
 age <  13 ──► status = rejected (below minimum platform age)
 ```
@@ -4,11 +4,6 @@
 > **Owner:** Platform team
 > **Related:** World chunk data format & persistence, server authority + client
 > prediction, content moderation & age verification, avatar component system
 > **Note:** the recommendation here stands, but edits do **not** ride the
 > `request_chunk_edit` ENet RPC (§4.2, §7.4). Per
 > [`world_persistence_impl.md`](world_persistence_impl.md) the editor saves
 > chunks over HTTP to the FastAPI backend, which is the sole writer; the
 > validation/moderation boundary moves with it.
 > **Godot version:** 4.6.2 stable
 ## 1. Overview
@@ -237,62 +237,6 @@ snapshot_state:
 ---
 ## 7a. Server Orchestration (implemented, PC3 Phase 2)
 **One dedicated server process per world**, spawned on demand.
 ```
 client                    backend (single worker)              host
  │  POST /api/worlds/{id}/join  (bearer JWT)                    │
  │ ───────────────────────────▶ GameServerSupervisor           │
  │                              ensure_server(world_id):        │
  │                                if none running for world ─── spawn:
  │                                                              godot --headless
  │                                                              res://scenes/server.tscn --
  │                                                              --port <p> --world <id>
  │                                                              --status-file <path>
  │  ◀─────────────────────────── { host, port, world_id }       │
  │                                                              │
  │  ENet connect  host:port ───────────────────────────────────▶ dedicated server
 ```
 - **Supervisor** (`backend/app/services/game_servers.py`): in-process singleton,
  so the backend MUST run single-worker. Keys servers by `world_id`. Allocates
  ports from `GAME_SERVER_PORT_MIN..MAX`. A background reaper kills a world's
  server once its **status file** (`{players, tick, updated}`, rewritten by the
  server ~1×/s) reports `players == 0` for `GAME_SERVER_IDLE_TIMEOUT_SECONDS`.
  No crash-restart — the next join respawns.
 - **Enable flag:** `GAME_SERVERS_ENABLED` (default off). The checkpoint/playtest
  launcher (`pm/checkpoint_ops.py`) turns it on, passes `GODOT_BIN`,
  `GAME_PROJECT_DIR`, and `GAME_SERVER_HOST` (the LAN IP baked into the `.exe`).
  A backend with it off returns **503** from `/join`, and the client falls back
  to local single-player.
 - **Per-world content:** all worlds currently load the same test level (M2/M7
  work). `world_id` still scopes a distinct process + session.
 ### 7b. Client play path
 `world_list.gd` → `POST /join` → `Session.begin(world_id, host, port)` →
 load `game.tscn`. `game.gd` sees `Session.active` and connects a
 `NetworkClient`:
 - **Local player** keeps predicting with its own collision-aware
  `CharacterBody3D` (`player.gd`) — that *is* the prediction. Its input frame
  (`player.net_input`) is forwarded to the server every physics tick.
 - **Correction backstop:** if the local position drifts from the server's by
  more than `CORRECTION_THRESHOLD` (1.5 m — generous; catches teleport / a wall
  walked through / real desync, not prediction noise) it snaps.
 - **Remote players:** rendered from snapshots, position lerped. *Appearance sync
  is a follow-up* — remotes currently show as labelled capsules; the server
  does not yet replicate avatar loadouts.
 - **Disconnect** → status message → back to the world list.
 The `NetworkClient`'s own flat-plane prediction + input-replay reconciliation
 (§5) is exercised by `smoke_test_network_client.gd`; the collision-aware game
 path above uses the lighter `send_input()` + drift-snap instead.
 ---
 ## 8. Security & Anti-Cheat
 - **No client-authoritative gameplay values.** Clients only send *inputs* and
@@ -1,194 +0,0 @@
 # PC2 Test Level & Player Spawn — Design Note
 > **Status:** Decided (PC2)
 > **Owner:** Architecture
 > **Consumers:** the two PC2 implementation tasks — (1) build the test level,
 > (2) build the player & spawn it. Both must be able to follow this note
 > without further design decisions.
 ## 1. Decision: static scene, not chunk streaming
 **The PC2 playable test level is a single, hand-authored, static Godot 3D
 scene.** It is **not** built through the chunk streaming system
 (`scripts/chunk_stream_manager.gd`, `chunk_scene.gd`, `chunk.gd`,
 `chunk_data_decoder.gd`).
 This is a deliberate decision, not a default:
 - **The streaming system has never been exercised with real content.** It is a
  faithful port of the `docs/architecture/world.md` format spec, but nothing in
  the project produces or serves chunk payloads for it to consume. `scenes/main.tscn`
  wires `chunk_stream_manager.gd` onto a bare `Node3D` with no `player` reference
  and no `_server_rpc`, so at runtime it does nothing. There is no server-side
  chunk authoring/streaming endpoint to integrate against.
 - **PC2 scope is single-player, local-only, no networking.** The value of chunk
  streaming is server-authoritative streaming around a moving player across a
  network boundary. None of those preconditions exist in PC2, so exercising the
  pipeline here would mean building a chunk *authoring + serving* path first —
  clearly out of checkpoint scope.
 - **A static scene is the lowest-risk way to get "spawn a player in a real 3D
  level and walk around" working**, which is the actual PC2 outcome being tested.
 Chunk streaming is **not removed and not broken by this decision** — it stays as
 an optional, later milestone. The static level is the PC2 proof of the *player*
 and *camera/physics* half of the problem; chunk streaming remains the later proof
 of the *world data* half.
 ## 2. Where things live
 | Artifact | Path | Owned by |
 |---|---|---|
 | Test level scene | `scenes/worlds/test_level.tscn` | level task |
 | Player scene | `scenes/player.tscn` | player task |
 | Player controller script | `scripts/player.gd` | player task |
 | Game composition scene | `scenes/game.tscn` | player task |
 - **`scenes/worlds/`** is the convention for all level scenes (it does not exist
  yet; the level task creates it). Future levels follow `scenes/worlds/<name>.tscn`.
 - `scenes/player.tscn` is **reusable** across levels — it must not hard-code any
  reference to `test_level`; it discovers the spawn point at runtime (see §3).
 ## 3. Player spawn convention
 The level scene **must** contain a `Marker3D` named exactly **`PlayerSpawn`**.
 That node's world transform is the spawn point.
 - `Marker3D` is a plain `Node3D` that shows a cross gizmo in the editor and
  carries no gameplay behavior — it is the established Godot idiom for "position
  hint." (Confirmed present in Godot 4.6.2.)
 - The marker's **position** is authoritative; its rotation is ignored by the
  player (spawn yaw is the player's concern, default forward is fine).
 - Coordinate system: **Y-up, units = meters, 1 unit = 1 m.** The marker must sit
  at least **1.0 m above the ground's top surface** (recommended `y = 1.0` where
  the ground top is `y = 0`) so the player capsule does not spawn intersecting
  the floor and get popped out by the physics solver.
 - There is exactly **one** `PlayerSpawn` per level. (If a level ever needs
  multiple spawns, that is a later convention — not PC2.)
 **Lookup rule (implemented by `player.gd`, not by the level):**
 ```
 # in player.gd _ready()
 var spawn := get_tree().current_scene.find_child("PlayerSpawn", true, false)
 if spawn is Node3D:
    global_position = spawn.global_position
 else:
    push_warning("player.gd: no PlayerSpawn marker found; spawning at origin")
    global_position = Vector3(0, 1.0, 0)   # fallback, do not crash
 ```
 The lookup runs from the current scene root so it finds the marker whether it is
 a direct child of the level instance or nested under a `Level` wrapper. The
 fallback keeps the player runnable in a scene that forgot its marker, but a
 **missing `PlayerSpawn` is a level bug** and the level task's smoke test must fail
 on it (see §6).
 ## 4. Composition (who puts level + player together)
 `scenes/game.tscn` is the PC2 playable entry point:
 ```
 Game (Node3D)
 ├── Level      (instance of res://scenes/worlds/test_level.tscn)
 └── Player     (instance of res://scenes/player.tscn)
 ```
 - `Game` is a plain `Node3D` with **no script** — composition is done by scene
  instantiation, not code, so there is nothing to keep in sync.
 - The **level scene is self-contained and has zero dependency on the player** —
  it loads and is smoke-testable on its own. The level task does not instance or
  reference `player.tscn`.
 - The **player scene is self-contained and has zero dependency on any specific
  level** — it only requires that the *current scene* contains a `PlayerSpawn`.
 - Ownership of `game.tscn` goes to the **player task**, which depends on the
  level task having landed `test_level.tscn` first (chain with `depends_on`).
 ## 5. Level content requirements (level task)
 `scenes/worlds/test_level.tscn`, root node `TestLevel` (`Node3D`). Required
 children:
 | Node | Type | Notes |
 |---|---|---|
 | `Ground` | `StaticBody3D` | `BoxShape3D` (e.g. `40 × 1 × 40`) centered at `(0, -0.5, 0)` so the **top face is `y = 0`**; matching `MeshInstance3D` (`BoxMesh`) so it is visible and collidable. Use a `StaticBody3D` rather than a bare `PlaneMesh` so collision is explicit and reliable. |
 | `Props` | `Node3D` | 3–5 simple props as `StaticBody3D` + `MeshInstance3D` using built-in primitives only (`BoxMesh`, `CylinderMesh`, `SphereMesh`). `assets/` is empty and PC2 must not require imported content. Positioned on the ground surface; scale freely. |
 | `Sun` | `DirectionalLight3D` | Pitch it downward (~ -45°), enable shadows if the compatibility renderer allows; shadows are optional. |
 | `WorldEnvironment` | `WorldEnvironment` | Ambient light and/or a simple background color. Keep it plain — the project uses `gl_compatibility`. |
 | `PlayerSpawn` | `Marker3D` | Per §3. Recommended `(0, 1.0, 0)`. |
 Notes:
 - **Do not** add any `script` to the level. It is pure content. Any per-level
  behavior belongs to the player (or a future game-mode script), not the level.
 - Keep the whole level on the XZ plane around the origin; nothing off at extreme
  coordinates, no thin walls the capsule can tunnel through.
 ## 6. Player contract (player task)
 `scenes/player.tscn`, root `Player` (`CharacterBody3D`) + `scripts/player.gd`.
 Minimum for PC2:
 - **Body:** `CharacterBody3D` with a `CollisionShape3D` using `CapsuleShape3D`
  (~`radius 0.3`, ~`height 1.8`) and a matching `CapsuleMesh` for visibility.
 - **Camera:** a `Camera3D` child. First-person (camera at capsule head height) is
  the lowest-risk choice; third-person is fine too but is more work.
 - **Spawn:** per §3 — read `PlayerSpawn` from the current scene, fall back
  gracefully.
 - **Movement:** gravity + `move_and_slide()` so the player stands on `Ground`.
  WASD/arrow locomotion is the hard requirement. Mouse-look is recommended but
  may be split into its own task if the controller grows.
 - **No networking, no avatar UI, no chunk code** — PC2 is local-only. Do not add
  `MultiplayerAPI`, `ChunkStreamManager`, or any avatar customization here.
 The player must work when instanced under `Game` alongside a level; it must not
 assume it is the only node in the scene.
 ## 7. Entry point / how a human plays it
 - `scenes/game.tscn` is the PC2 playable scene. For playtesting, load it directly
  (e.g. `godot --path . scenes/game.tscn`), or temporarily set
  `application/run/main_scene` to it.
 - **Wiring "Play → Join a world" in the existing `world_list` UI is out of scope
  for this note** and out of scope for the level/player tasks. The current menu
  flow ends at browse-worlds (PC1). If a checkpoint wants a clickable path into
  the test level, that navigation wiring is its own small task — do not fold it
  into level or player.
 ## 8. Validation (both tasks must run this before "done")
 ```sh
 # one-time, first checkout only — builds the class/import cache
 godot --headless --path . --import
 # then, to catch parse/load errors:
 godot --headless --path . --quit
 ```
 - **Level task:** additionally load `test_level.tscn` headlessly and assert it
  (a) loads without error and (b) contains a `Marker3D` named `PlayerSpawn`
  positioned ≥ 1.0 m above the ground top. A smoke script following the existing
  `scripts/smoke_test_*.gd` pattern is the right vehicle.
 - **Player task:** a smoke test that instantiates `game.tscn`, waits a frame,
  and asserts the player's global position equals the `PlayerSpawn` position
  (within a small epsilon). This is the check that proves the spawn convention
  actually wired through — not just "the scene loads."
 ## 9. Explicitly out of scope for PC2
 - Networking / multiplayer / prediction (single-player, local-only).
 - Chunk streaming integration and server-side chunk authoring/serving.
 - Avatar customization UI and glTF avatar loading.
 - Join-a-world navigation from the world list.
 - Any content moderation / age-gating logic in the level.
 ## 10. Summary
 | Concern | Decision |
 |---|---|
 | Level construction | Static hand-authored Godot 3D scene (chunk streaming deferred, not removed) |
 | Level location | `scenes/worlds/test_level.tscn` |
 | Spawn convention | `Marker3D` named `PlayerSpawn`, ≥ 1.0 m above ground, looked up by the player |
 | Player | `scenes/player.tscn` (`CharacterBody3D`) + `scripts/player.gd`, reusable across levels |
 | Composition | `scenes/game.tscn` instances `Level` + `Player`; no script |
 | Entry point | Load `scenes/game.tscn` directly; UI join-wiring deferred |
@@ -1,10 +1,6 @@
 # World Chunk Data Format & Persistence Architecture
-> **Status:** Proposed. The chunk format (§2, §3) is normative and implemented
+> **Status:** Proposed
 > on the client. **§4 (SQLite schema) and §5 (write ownership / write-behind)
 > are superseded by [`world_persistence_impl.md`](world_persistence_impl.md)**,
 > which stores chunks in the existing Postgres backend and makes the FastAPI
 > process — not the per-world Godot server — the sole writer.
 > **Owner:** Platform team
 > **Related:** Server authority + client prediction, avatar component system, content moderation & age verification, backend auth (JWT)
@@ -1,655 +0,0 @@
 # World Persistence: Server-Side Implementation Architecture
 > **Status:** Accepted (design). Implementation is split across two follow-on
 > tasks (backend endpoints; editor wiring).
 > **Owner:** Platform team
 > **Supersedes:** the *storage engine* and *write ownership* parts of
 > [`world.md`](world.md) §4 and §5. Everything else in `world.md` — the chunk
 > logical model, the JSON and binary encodings, checksums, revisions, content
 > flags — stands unchanged and is normative.
 > **Related:** [`world.md`](world.md) (chunk format), [`editor.md`](editor.md)
 > (authoring surface), [`networking.md`](networking.md) (ENet sim transport),
 > [`content_moderation.md`](content_moderation.md) (flags & gating).
 ## 1. Why this document exists
 `world.md` was written during the client-side chunk-streaming work (M2). It
 assumes **one** server that owns **one** embedded SQLite file and is both the
 authoritative simulation and the authoritative store. That is not the system we
 built. What actually exists today is:
 | Process | Lifetime | Owns | Code |
 |---|---|---|---|
 | FastAPI backend | always on, single worker | Postgres (users, worlds, assets, avatar loadouts), game-server orchestration | `backend/app/` |
 | Godot dedicated server, one per world | **spawned on join, reaped ~5 min after the last join when empty** | nothing durable; a 30 Hz in-memory player sim | `scripts/server.gd`, spawned by `backend/app/services/game_servers.py` |
 | Godot client | player session | local chunk streaming, the in-game editor (planned) | `scripts/chunk_stream_manager.gd`, `scripts/chunk_data_decoder.gd` |
 Nothing server-side has ever stored or served a real chunk. `server.gd`
 `preload()`s `res://scenes/worlds/test_level.tscn` for **every** world and uses
 `world_id` only for logging and the status file. `ChunkStreamManager` has a
 `set_server_rpc()` seam that no code calls. The backend's `World` model is
 metadata only (`id`, `name`, `description`, `owner_id`, `visibility`).
 This document decides where chunk content lives, who may write it, how the
 dedicated server gets it, and the exact API surface — so the two implementation
 tasks that follow have no architectural decisions left to make.
 ---
 ## 2. Decisions at a glance
 | # | Question | Decision |
 |---|---|---|
 | D1 | Where does chunk data live at rest? | **Postgres**, in the existing backend database. Not a per-world SQLite file. |
 | D2 | Who writes it? | **The FastAPI backend, exclusively.** The editor writes through it over HTTP with optimistic concurrency. The dedicated Godot server never writes world content. |
 | D3 | How does the dedicated server get content? | **HTTP pull from the backend at startup**, over a loopback-only `/api/internal` route authenticated by a per-spawn token the supervisor mints. Lazy fetch as players roam. |
 | D4 | Edit while a live session exists? | **Out of scope this milestone, with a defined seam.** The editor is a non-joined client mode; writes always succeed and the response flags `live_session` so the UI can say "players see this when the session restarts". |
 | D5 | Edit granularity on the wire | **Full-chunk PUT with `base_revision`**, not RFC-6902 deltas. |
 | D6 | Client chunk transport | **HTTP from the backend**, not ENet from the dedicated server. The `set_server_rpc()` seam is satisfied by an HTTP-backed adapter. |
 ---
 ## 3. D1 — Chunk data lives in Postgres
 ### 3.1 Decision
 World content (rooms, chunk payloads, chunk revisions) is stored in the
 **existing Postgres database**, alongside `worlds`, in new tables created by an
 Alembic migration. `world.md` §4's `world.db` SQLite file is **not** built.
 The chunk **payload stays exactly what `world.md` §3.6 specifies**: the 48-byte
 header + sectioned binary body, checksummed with SHA-256. It moves from a
 SQLite `BLOB` to a Postgres `BYTEA`. Nothing about the format changes, so
 `scripts/chunk_data_decoder.gd` remains correct and the format spec stays the
 single contract.
 ### 3.2 Reasoning
 1. **SQLite's premise does not hold here.** `world.md` §4 justifies SQLite as
   "ideal for a server that owns the world store". No process in this system
   owns a world store: the only process that could plausibly hold the file (the
   dedicated Godot server) is *ephemeral* — reaped when idle, `SIGTERM`'d on
   backend shutdown, `SIGKILL`'d 10 s later if it doesn't exit, and orphaned
   entirely if the backend dies. Meanwhile the editor must write when no such
   process exists. So the file would have to be shared by two processes with
   independent lifetimes, which is precisely the workload SQLite's
   single-writer/file-lock model handles worst.
 2. **Postgres is already a hard dependency; SQLite would be a second one.** The
   backend cannot start without Postgres. Adding a per-world SQLite file adds a
   second storage engine, a second migration system (`world.md` §4.8 specifies a
   hand-rolled `meta.schema_version` runner *next to* the Alembic we already
   have), a second backup story, and a second consistency story.
 3. **Referential integrity with metadata we already have.** `worlds` rows carry
   `owner_id` and `visibility`, and every authorization rule for content derives
   from them. In one database this is a join and a foreign key with
   `ON DELETE CASCADE`; across two engines, deleting a world silently orphans a
   file on disk and every ownership check becomes a cross-store read.
 4. **Concurrency is the normal case, not the edge case.** Two creators editing
   one world, or an editor writing while the backend serves chunks to a running
   dedicated server, are ordinary. Postgres gives row-level MVCC and real
   transactions for the read-modify-write in §5.4; SQLite gives a database-level
   write lock and `SQLITE_BUSY`.
 5. **The repo already has the precedent and the plumbing.** `avatar_loadouts`
   (migration `0004`) stores a client-shaped document in Postgres JSONB rather
   than inventing a side store, and `backend/app/database.py` already provides
   the async session factory this code will use.
 ### 3.3 What we give up, and why it's acceptable
 - **Zero-config embedding.** Irrelevant — the backend already requires a
  configured Postgres.
 - **`world.md` §5.5 write-behind + the `dirty` column.** Deliberately dropped
  (§4.4). It existed to amortize disk I/O for a process that owned the file. Our
  writes are human-rate editor saves, not sim-rate; each one is a single
  transaction and is durable when the HTTP response returns. Dropping it also
  deletes the entire "unclean shutdown recovery" scan in §5.5 — there is no
  window in which committed content can be lost.
 - **Sharding by `world_id` (`world.md` §8).** Postgres partitioning by
  `world_id` remains available on the same table shape if a single table ever
  becomes a bottleneck. At ~2–8 KB per chunk, 10 000 chunks is under 100 MB.
 ---
 ## 4. Schema (Alembic migration `0005_add_world_content_tables`)
 New model module: `backend/app/models/world_content.py`, registered in
 `backend/app/models/__init__.py`. `backend/app/models/world.py` is left alone
 except for one added relationship, so nothing PC1/PC2 depends on moves.
 Conventions follow the existing models: `Column(...)` declarative style,
 `Integer` surrogate PKs, `DateTime(timezone=True)` with `server_default=func.now()`,
 JSONB for document-shaped fields (as `avatar_loadout.py` does).
 ### 4.1 `world_rooms`
 ```python
 class WorldRoom(Base):
    __tablename__ = "world_rooms"
    id         = Column(Integer, primary_key=True, index=True)
    world_id   = Column(Integer, ForeignKey("worlds.id", ondelete="CASCADE"),
                        nullable=False, index=True)
    slug       = Column(String(64), nullable=False)   # url-safe; "main" by default
    name       = Column(String(255), nullable=False)
    # Chunk grid config. world.md §2.2 puts this on the world; it lives on the
    # room so a world can later hold rooms with different grids, and so this
    # migration is purely additive (the existing `worlds` table is untouched).
    grid       = Column(JSONB, nullable=False,
                        server_default='{"size": [32, 32, 1], "origin": [0, 0, 0]}')
    bounds     = Column(JSONB, nullable=True)   # {"min":[x,y,z], "max":[x,y,z]}; null = unbounded
    spawn      = Column(JSONB, nullable=True)   # {"pos":[x,y,z], "yaw": 0.0}
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at = Column(DateTime(timezone=True), server_default=func.now(),
                        onupdate=func.now(), nullable=False)
    __table_args__ = (UniqueConstraint("world_id", "slug", name="uq_world_rooms_world_slug"),)
 ```
 `World` gains
 `rooms = relationship("WorldRoom", back_populates="world", cascade="all, delete-orphan")`.
 Every world gets a `main` room: created in `create_world`, and lazily created on
 first room read/write for worlds that predate the migration. `grid` defaults
 match `Chunk.CHUNK_SIZE_*` in `scripts/chunk.gd`, which is the client's source
 of truth for the same constants.
 ### 4.2 `world_chunks`
 ```python
 class WorldChunk(Base):
    __tablename__ = "world_chunks"
    id             = Column(Integer, primary_key=True, index=True)
    world_id       = Column(Integer, ForeignKey("worlds.id", ondelete="CASCADE"),
                            nullable=False, index=True)   # denormalized: world-scoped queries
    room_id        = Column(Integer, ForeignKey("world_rooms.id", ondelete="CASCADE"),
                            nullable=False, index=True)
    chunk_key      = Column(String(160), nullable=False, unique=True)   # see §4.5
    cx             = Column(Integer, nullable=False)
    cy             = Column(Integer, nullable=False)
    cz             = Column(Integer, nullable=False, server_default="0")
    format_version = Column(Integer, nullable=False, server_default="1")
    payload        = Column(LargeBinary, nullable=False)   # world.md §3.6 bytes, BYTEA
    payload_len    = Column(Integer, nullable=False)
    checksum       = Column(String(64), nullable=False)    # SHA-256 hex of payload body
    revision       = Column(Integer, nullable=False, server_default="1")
    content_flags  = Column(JSONB, nullable=False, server_default="{}")  # world.md §3.4
    is_mature      = Column(Boolean, nullable=False, server_default="false")
    updated_by_id  = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    created_at     = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at     = Column(DateTime(timezone=True), server_default=func.now(),
                            onupdate=func.now(), nullable=False)
    __table_args__ = (
        UniqueConstraint("room_id", "cx", "cy", "cz", name="uq_world_chunks_coord"),
        Index("ix_world_chunks_room_coord", "room_id", "cx", "cy", "cz"),
        Index("ix_world_chunks_mature", "world_id", postgresql_where=text("is_mature")),
    )
 ```
 Deltas from `world.md` §4.4:
 - **Surrogate `id` PK + unique coordinate constraint**, with `chunk_key` kept as
  a unique denormalized column. The key string is the client-facing contract
  (`Chunk.build_key`) and is embedded in the payload, so storing it gives a
  single-index lookup by key; the coordinate constraint is what actually
  enforces one chunk per cell.
 - **`dirty` removed** — see §3.3.
 - **Content flags folded into the chunk row as JSONB + an indexed `is_mature`
  boolean**, instead of `world.md` §4.6's separate 11-column `content_flags`
  table. The flags are a document the client already produces in exactly this
  shape (`ChunkDataDecoder.ContentFlags.to_dict()`), the only query we anticipate
  is "is this mature", and folding them in removes a second write per save and
  the `object_id = ''` sentinel hack that §4.6 needed to work around SQLite's
  NULL-in-primary-key behaviour (Postgres has the same NULL semantics, so the
  hack would have carried over).
 - **`world.md` §4.5 `chunk_objects` is deferred, not dropped.** It is a derived
  index that exists to answer queries ("which chunks contain a door?") that no
  code asks yet, and maintaining it means a delete-and-reinsert of every object
  row on every save. It is fully rebuildable from `payload`, so it can be added
  in its own migration the day a query needs it, with a backfill. Do **not**
  build it in `0005`.
 ### 4.3 `world_chunk_revisions`
 ```python
 class WorldChunkRevision(Base):
    __tablename__ = "world_chunk_revisions"
    id         = Column(Integer, primary_key=True, index=True)
    chunk_key  = Column(String(160), nullable=False, index=True)  # deliberately NOT a FK
    world_id   = Column(Integer, nullable=False, index=True)      # also not a FK, same reason
    revision   = Column(Integer, nullable=False)
    action     = Column(String(16), nullable=False)               # 'create' | 'update' | 'delete'
    actor_id   = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
    checksum   = Column(String(64), nullable=False)
    payload    = Column(LargeBinary, nullable=True)               # full payload at this revision
    created_at = Column(DateTime(timezone=True), server_default=func.now(), nullable=False)
 ```
 Kept from `world.md` §4.7 including its two design points: the full payload is
 stored (rollback needs it) and `chunk_key`/`world_id` are **not** foreign keys,
 so deleting a chunk or a world preserves the audit trail.
 **Retention (new, required):** this table grows without bound — a creator
 dragging a brush can produce hundreds of revisions per minute. The
 implementation must ship a retention policy from day one: keep the newest
 `WORLD_CHUNK_REVISION_KEEP` (default 20) payloads per `chunk_key` and null out
 `payload` on older rows (keeping the metadata row for the audit trail), pruned
 in the same transaction as the write. A `created_at` index supports a later
 time-based prune.
 ### 4.4 Config additions (`backend/app/config.py`)
 ```
 WORLD_CHUNK_MAX_PAYLOAD_BYTES: int = 1_048_576   # 1 MiB; a dense 32×32 uint16 layer is 2 KiB
 WORLD_CHUNK_MAX_OBJECTS: int = 512
 WORLD_CHUNK_MAX_BATCH: int = 64
 WORLD_CHUNK_REVISION_KEEP: int = 20
 GAME_SERVER_INTERNAL_API_URL: str = "http://127.0.0.1:8000"
 ```
 ### 4.5 Chunk key format
 `world.md` §2.3 specifies `"{world_id}:{room_id}:{cx}:{cy}:{cz}"` and illustrates
 it with `w_0001:r_0001`. Those ids were illustrative. The real key uses the
 backend's identifiers:
 ```
 "{world.id}:{room.slug}:{cx}:{cy}:{cz}"      e.g.  "12:main:3:-1:0"
 ```
 The room **slug** rather than its numeric id, so a key is human-readable in logs
 and stable if rooms are ever re-imported. `Chunk.build_key()` in
 `scripts/chunk.gd` already produces this shape unmodified.
 ---
 ## 5. D2 — The FastAPI backend is the only writer
 ### 5.1 Decision
 The in-game editor (`editor.md` §7.2) submits edits over **HTTP to the FastAPI
 backend**, which validates, versions, and persists them. The dedicated Godot
 server process **never writes world content** and does not sit in the edit path.
 This preserves `world.md`'s and `editor.md`'s actual invariant — *clients never
 touch storage; they submit edits to a server-authoritative tier that validates
 them* — while identifying that tier as the always-on backend rather than the
 ephemeral sim process. `editor.md` §4.2's claim that edits ride the same
 `request_chunk_edit` RPC as gameplay is the one part of that doc this design
 changes; the moderation and validation properties it derives from that claim are
 unaffected, because the validation boundary moves with the writer.
 ### 5.2 Reasoning
 1. **Nothing that can vanish in 300 seconds may own the write path.** The reaper
   in `game_servers.py` `stop()`s an idle server with `SIGTERM` and escalates to
   `SIGKILL` after 10 s; `supervisor.shutdown()` does the same to every server on
   backend shutdown; and if the backend dies uncleanly the servers are orphaned
   with no one to flush them. Because the sim process holds no unsaved world
   content in this design, **no reap, crash, or kill can ever lose world data** —
   that is the single strongest practical reason for this split.
 2. **Editing must work with no dedicated server running.** A creator opening
   their world to build should not have to spin up a 30 Hz sim process, burn a
   port from the 100-port range, and hold it for 5 minutes past their last save.
 3. **`server.gd` has no database access, no credentials, and no HTTP client.**
   Routing writes through it means either shipping Postgres credentials into a
   process spawned per join, or building an ENet→HTTP proxy inside the sim loop.
   Both are strictly worse than the editor calling the backend directly.
 4. **Authorization already lives in the backend.** `CurrentUser`, the
   `owner_id` check, and `WorldVisibility` are all there. The dedicated server
   has no user identities at all — it knows peer ids, not accounts.
 ### 5.3 Authorization
 - **Read** a chunk: the same rule as `GET /api/worlds/{id}` — the world is
  `PUBLIC`, or the caller owns it. Otherwise 404 (not 403), matching the
  existing routers' deliberate non-disclosure.
 - **Write** a chunk: caller must be `world.owner_id`, matching `update_world`;
  403 otherwise. Collaborator/role-based editing is future work and slots in at
  this one check.
 - **Mature gating hook:** `is_mature` chunks are where `content_moderation.md`'s
  age gate attaches on the read path. Specify the column and the index now; the
  gate itself lands with that doc's work.
 ### 5.4 Concurrency
 Optimistic concurrency exactly as `world.md` §5.4, expressed over HTTP:
 1. Reader gets `revision` (header `X-Chunk-Revision`, or the JSON field).
 2. Writer sends `base_revision`.
 3. The service does `SELECT ... FOR UPDATE` on the chunk row, compares
   `base_revision` to `revision`, and either commits at `revision + 1` or returns
   **409** with `current_revision` and `current_checksum` so the editor can
   re-fetch and re-apply.
 4. `base_revision: 0` means "create; fail with 409 if it already exists".
 ### 5.5 Validation (the backend must not trust the client)
 The write path decodes the submitted payload server-side before storing it. This
 requires a **Python port of the `world.md` §3.6 codec** —
 `backend/app/services/chunk_codec.py`, mirroring `scripts/chunk_data_decoder.gd`.
 It checks: magic `AGPC`, `format_version <= 1`, declared vs. actual
 `payload_len`, **recomputed** SHA-256 (the header's checksum is advisory), tile
 layer dims equal the room's `grid.size`, tile indices in palette range, object
 count ≤ `WORLD_CHUNK_MAX_OBJECTS`, object positions inside the chunk's bounds,
 `chunk_key` in the payload matching the URL, and string-field length limits
 (`world.md` §7). `content_flags` and `is_mature` are **recomputed** from the
 payload's flag sections, never taken from the request body.
 **Drift control (required):** the two codecs must be pinned by golden files —
 fixture chunks under `tests/fixtures/chunks/` encoded by one implementation and
 decoded byte-identically by the other, asserted in both the pytest suite and the
 Godot headless suite. Without this the format has two implementations and no
 contract test, which is exactly the failure `world.md` §5.2 was trying to avoid
 by having one shared implementation.
 ---
 ## 6. D4 — Editing versus a live session (scope boundary)
 **In scope for this milestone:**
 - The editor is entered as **"Edit world" from the world browser**: a non-joined
  client mode. It does **not** call `POST /api/worlds/{id}/join`, does not open
  an ENet connection, and does not spawn a dedicated server. It loads chunks over
  HTTP, edits them locally, and saves them over HTTP.
 - Writes always succeed regardless of whether a session is live. The write
  response carries `live_session: bool` (from `supervisor.debug_state()`), so the
  editor can surface *"this world has players in it right now — they'll see your
  changes when the session restarts."*
 - A dedicated server started **after** a write sees the new content, because it
  loads from the store at startup (§7).
 **Explicitly out of scope, deferred:**
 - Build-in-place while joined to a live session.
 - `chunk_invalidated` push to connected clients (`world.md` §5.3) and hot-reload
  of the dedicated server's collision world.
 - Live collaborative editing / cursors (`editor.md` §9).
 **The seam that makes the deferred work cheap:** the manifest endpoint (§7.2)
 returns a monotonic `content_revision` for the world, bumped on every chunk
 write. Hot reload is then: the dedicated server polls the manifest on a timer
 (or the backend pushes to it over the same internal channel), re-fetches the
 chunks whose revision changed, and rebuilds those collision bodies. Nothing in
 this design has to change to add it.
 **Why the editor must not join:** if it joined, the sim process would enforce
 collision against content it loaded at spawn while the creator edits a diverging
 local copy — players would walk through new walls and bounce off deleted ones,
 with no error anywhere. Making build mode non-joined turns a silent correctness
 bug into an explicit product boundary.
 ---
 ## 7. D3 — What the dedicated server does at startup
 ### 7.1 Decision
 `server.gd` pulls its world's content from the backend over **HTTP** at startup,
 authenticated by a **per-spawn token** the supervisor mints, and **does not bind
 the ENet port until content is loaded**.
 Rejected alternative — *supervisor writes a whole-world snapshot file at spawn
 and passes `--world-file`*: attractive (no new auth surface, no HTTP client in
 the sim process), but it makes spawn latency proportional to world size, gives
 the server no way to fetch a chunk lazily as players roam beyond the preloaded
 set, and still needs a separate channel for the hot-reload work above. Rejected —
 *give the Godot process a Postgres connection*: there is no PG driver in
 GDScript, and it would put database credentials in a process spawned per join.
 ### 7.2 Startup sequence
 1. `_parse_args()` gains `--api-url` and `--server-token` (§7.3).
 2. `GET /api/internal/worlds/{world_id}/manifest` → rooms, per-room `grid`,
   `bounds`, `spawn`, `chunk_count`, and the world's `content_revision`.
 3. `GET /api/internal/worlds/{world_id}/rooms/{slug}/chunks?` bounds query for
   the spawn neighbourhood (radius from the spawn point, default 3 chunks), then
   fetch each payload; decode with the existing `ChunkDataDecoder` and build
   static collision from the tile layers and objects.
 4. **Then** `network_peer.create_server(port)`, then write the status file.
 5. **Fallback:** if the backend is unreachable, the world has no rooms, or the
   room has zero chunks, load `test_level.tscn` as today and record
   `"content": "fallback"` in the status file. A content outage must never make
   a world un-joinable, and this keeps every PC3 flow working before any world
   has authored content.
 During the session the server may lazily fetch chunks as players approach
 unloaded coordinates, through the same internal route. It **never writes**.
 Dynamic entity runtime state (positions, health) stays in memory and out of
 chunks, exactly as `world.md` §3.3 already specifies. Shutdown flushes nothing.
 ### 7.3 Internal authentication
 `GameServerSupervisor._spawn()` generates `token = secrets.token_urlsafe(32)`,
 stores it on the `_WorldServer` dataclass, and passes it on the command line
 alongside the existing `--port/--world/--status-file`. A FastAPI dependency
 `require_game_server` resolves `Authorization: Bearer <token>` against
 `supervisor.validate_token(world_id, token)` — a dict lookup, since the
 supervisor is an in-process singleton. Properties this gives us:
 - A token grants access to **one** world and **dies with its process** (the
  reaper's `del self._servers[wid]` invalidates it).
 - No long-lived shared secret in config or on disk.
 - It reuses the **already documented** single-worker constraint in
  `game_servers.py`; it does not add a new one.
 Rejected alternative — *let the dedicated server use the public routes with a
 service user account*: the public routes enforce per-user visibility and
 ownership, which a service identity would have to be exempted from, and it would
 pollute `updated_by_id`/audit rows with a fake user. A separate `/api/internal`
 prefix keeps the two auth models apart and can be blocked at the reverse proxy.
 ### 7.4 Lifecycle changes this requires in `game_servers.py`
 These are real, load-bearing findings from the current implementation:
 - **`_await_port()` is the wrong readiness signal now.** It returns as soon as
  the UDP port is bound, and the port is bound before content exists today. With
  content loading it must await a `"ready": true` field that `server.gd` writes
  to the status file *after* content load + `create_server`. Otherwise the
  backend hands a client an address for a server that is still fetching chunks.
 - **`_await_port()` fails open.** After its 8 s deadline it returns normally,
  with no error — `ensure_server` then reports success for a server that may
  never have started. Content loading makes a slow start more likely, so the
  readiness wait needs a real timeout error (503 to the joining client) and a
  longer, configurable deadline.
 - **The status file is the only server→backend channel**, and `_spawn` currently
  passes no credentials at all — hence §7.3.
 - **`player_count()` returns 0 when the status file is missing or unparseable**,
  so a live server whose status write fails can be reaped after the idle timeout.
  Harmless for data (the sim owns nothing durable — the point of D2) but worth a
  comment where the fallback lives.
 - **No crash restart** (documented in the module docstring): if a server dies,
  the next join respawns it and it reloads content from the store. With D2 this
  is now genuinely safe rather than merely tolerated.
 ---
 ## 8. API surface
 All paths are under the existing `worlds` router prefix (`/api/worlds`) unless
 noted. New router module: `backend/app/routers/world_content.py`, mounted at
 `/api/worlds`; internal routes in `backend/app/routers/internal.py` at
 `/api/internal`.
 ### 8.1 Public (editor & player client; JWT `CurrentUser`)
 | Method | Path | Purpose |
 |---|---|---|
 | `GET` | `/api/worlds/{world_id}/rooms` | List rooms + grid config |
 | `POST` | `/api/worlds/{world_id}/rooms` | Create a room (owner) |
 | `GET` | `/api/worlds/{world_id}/rooms/{slug}/chunks` | Chunk **index** over a bounds query |
 | `GET` | `/api/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}` | Fetch one chunk |
 | `PUT` | `/api/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}` | Write one chunk |
 | `PUT` | `/api/worlds/{world_id}/rooms/{slug}/chunks` | Write up to `WORLD_CHUNK_MAX_BATCH` chunks atomically |
 | `DELETE` | `/api/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}` | Delete one chunk |
 | `GET` | `/api/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}/revisions` | Revision history (owner) |
 | `POST` | `/api/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}/rollback` | Restore a revision (owner) |
 **Room list** — `GET .../rooms` → `200`
 ```json
 [{ "id": 7, "slug": "main", "name": "Main",
   "grid": { "size": [32, 32, 1], "origin": [0, 0, 0] },
   "bounds": null,
   "spawn": { "pos": [0, 1.5, 0], "yaw": 0.0 },
   "chunk_count": 41 }]
 ```
 **Chunk index** — `GET .../chunks?cx_min=&cx_max=&cy_min=&cy_max=&cz=0` → `200`.
 Payloads are *not* included; this is `world.md` §5.1's `list_chunks(bounds)` and
 lets a streamer decide what to fetch and skip anything already cached by
 checksum.
 ```json
 { "room": "main", "content_revision": 118,
  "chunks": [{ "key": "12:main:0:0:0", "cx": 0, "cy": 0, "cz": 0,
               "revision": 4, "checksum": "9f86…", "payload_len": 2344,
               "is_mature": false, "updated_at": "2026-09-14T10:02:11Z" }] }
 ```
 Bounds are capped (default 32×32 chunks per query) and return `422` beyond that.
 **Chunk fetch** — `GET .../chunks/{cx}/{cy}/{cz}`, content-negotiated:
 - `Accept: application/octet-stream` (default for the game client) → `200` with
  the raw `world.md` §3.6 bytes, `ETag: "<checksum>"`,
  `X-Chunk-Revision: <n>`, `X-Chunk-Key: <key>`.
 - `Accept: application/json` (tooling, tests, the editor's debug view) → the
  §3.5 JSON encoding, decoded server-side from the payload. JSON is derived, never
  stored, so there is no dual-write drift (`world.md` §4.4).
 - `If-None-Match: "<checksum>"` → `304`. This is what makes the client's
  `user://chunk_cache/` cache cheap and is why the checksum is the ETag.
 - `404` if the chunk does not exist (an unwritten coordinate is not an error to
  the streamer — it renders empty).
 **Chunk write** — `PUT .../chunks/{cx}/{cy}/{cz}`
 ```
 Content-Type: application/octet-stream
 X-Base-Revision: 4          # 0 = create
 <binary payload>
 ```
 or, for clients that prefer JSON:
 `{"base_revision": 4, "payload_b64": "…"}`.
 Responses:
 | Code | Body / meaning |
 |---|---|
 | `200` | `{"key", "revision", "checksum", "payload_len", "updated_at", "is_mature", "live_session"}` |
 | `409` | `{"detail": "revision conflict", "current_revision": 6, "current_checksum": "…"}` |
 | `403` | not the world owner |
 | `404` | world or room not found / not visible |
 | `413` | payload over `WORLD_CHUNK_MAX_PAYLOAD_BYTES` |
 | `422` | decode/validation failure (`{"detail", "reason"}`, e.g. `checksum_mismatch`, `layer_dims`, `object_out_of_bounds`) |
 **Batch write** — `PUT .../chunks` with
 `{"chunks": [{"cx","cy","cz","base_revision","payload_b64"}, …]}`. Applied in
 **one transaction, all-or-nothing**: if any entry conflicts, nothing is written
 and the response is `409` naming the offending coordinate. Justification: an
 editor brush stroke or an object drag routinely straddles a chunk boundary, and
 without a batch the editor either issues N round trips or leaves half of a user
 action persisted. Capped at `WORLD_CHUNK_MAX_BATCH` chunks and 8 MB.
 ### 8.2 D5 — Full-chunk PUT, not JSON-Patch deltas
 `world.md` §5.4 specifies RFC-6902 deltas against `base_revision`. This design
 sends **whole chunks** instead.
 - A 32×32×1 chunk is ~2 KB of dense tile indices plus its objects — a few KB.
  The bandwidth a patch saves is negligible at editor rates.
 - The stored form is an opaque binary blob. Patching it means the backend must
  decode → apply a JSON-Patch → re-encode → re-checksum, i.e. implement and test
  a *second* mutation format on top of the codec, with its own failure modes, and
  keep it in sync with the client's patch generator. That is the same dual-path
  drift risk `world.md` §5.2 exists to prevent.
 - Lost-update protection comes from `base_revision`, not from the patch, so
  nothing is given up on correctness.
 Delta encoding stays available as a pure bandwidth optimization later —
 `world.md` §8 already files it as future work.
 ### 8.3 Internal (dedicated server; `require_game_server` token)
 | Method | Path | Purpose |
 |---|---|---|
 | `GET` | `/api/internal/worlds/{world_id}/manifest` | Rooms, grids, spawn, `content_revision`, chunk counts |
 | `GET` | `/api/internal/worlds/{world_id}/rooms/{slug}/chunks` | Bounds index (same shape as §8.1) |
 | `GET` | `/api/internal/worlds/{world_id}/rooms/{slug}/chunks/{cx}/{cy}/{cz}` | Binary payload |
 Read-only by construction — there is no internal write route, and adding one
 would violate D2. The token is world-scoped, so a path whose `world_id` differs
 from the token's world is `403`. These routes skip the per-user visibility check
 (the sim process has no user) and apply no mature gating (gating is a client/user
 concern; the server still needs collision).
 ### 8.4 D6 — The client streams chunks over HTTP, not over ENet
 `world.md` §5.3 routes `request_chunk` / `chunk_data` over the game's ENet
 connection. This design has the playing client fetch chunks from the **backend
 over HTTP**, the same routes the editor uses.
 - The dedicated server has no content the backend doesn't have; proxying bytes
  through it adds a hop and puts multi-megabyte reliable transfers in contention
  with the 30 Hz snapshot broadcast on the same ENet peer.
 - HTTP gives caching for free — `ETag`/`If-None-Match` on the checksum, and a
  local `user://chunk_cache/<checksum>` that survives sessions.
 - `ApiClient` (`scripts/api_client.gd`) already carries the JWT and the result
  contract; no new transport code.
 **This does not require rewriting `ChunkStreamManager`.** It already calls
 through a `set_server_rpc()` seam that only needs an object with
 `request_chunk(key)`. The editor-wiring task supplies an `HttpChunkSource` that
 implements that method against `ApiClient` and feeds
 `_on_chunk_data_received(key, bytes)` — which also finally gives that dormant
 seam a caller. Note the existing `_load_chunk()` builds its key with empty
 world/room ids (`Chunk.build_key("", "", coord)`); the adapter must supply the
 real world id and room slug.
 ---
 ## 9. What each follow-on task owns
 **Backend task**
 - `backend/app/models/world_content.py` + `0005_add_world_content_tables`
 - `backend/app/services/chunk_codec.py` (Python port of `world.md` §3.6) and the
  golden-file fixtures shared with the Godot suite
 - `backend/app/services/world_store.py` (the `world.md` §5.1 service interface,
  minus `flush_dirty`/`rebuild_index`, over Postgres)
 - `backend/app/routers/world_content.py`, `backend/app/routers/internal.py`
 - `game_servers.py`: per-spawn token, `--api-url`/`--server-token` args,
  readiness-from-status-file instead of `_await_port` (§7.4)
 - `create_world` creates the `main` room
 **Client/editor task**
 - `HttpChunkSource` adapter → `ChunkStreamManager.set_server_rpc()`
 - Editor save path (single + batch PUT), 409 conflict re-fetch-and-reapply,
  `live_session` warning UI
 - "Edit world" entry from the world browser that does **not** join
 - `server.gd`: arg parsing, manifest + chunk fetch before `create_server`,
  collision build from decoded chunks, `test_level.tscn` fallback,
  `"ready"`/`"content"` fields in the status file
 ---
 ## 10. Open questions (deliberately not decided here)
 - **Hot reload / build-in-place** while a session is live (§6) — the
  `content_revision` seam is in place for it.
 - **Collaborator permissions** beyond `owner_id` — one check in §5.3.
 - **Mature-content gating** on the read path — column and index exist; the
  policy belongs to `content_moderation.md`.
 - **`world_chunk_objects`** derived index — spec'd in `world.md` §4.5, build it
  when a query needs it (§4.2).
 - **Payload compression** — the §3.6 header reserves a flags bitmask; Postgres
  TOAST already compresses `BYTEA`, so measure before adding a second layer.
 - **Chunk streaming for very large worlds** — the bounds-query cap in §8.1 is a
  guardrail, not a scaling plan.
@@ -1,97 +0,0 @@
 # Package Checkpoint 3 (PC3)
 > **Status: partial.** PC3's planned scope was M4-avatars + M5-multiplayer +
 > Foundation Hardening + M6–M10 (see `docs/build-plan-v1.md`). As of
 > 2026-09-05, **M4, M5, and most of Foundation Hardening are done and
 > checkpoint-verified**; M6–M10 have not been started. This doc records what
 > is real. Whether to call this "PC3" (redefined scope, M6–M10 → PC4) or keep
 > PC3 open is a user decision.
 Built by Claude directly (fleet offline), branch `pc3` → `main`.
 ## What's real and verified (`scripts/run_checkpoint_tests.py`, all green)
 | Check | Result |
 |---|---|
 | Alembic migrations, fresh DB | PASS |
 | Backend `pytest` | 77/77 PASS (hermetic — auto-starts an ephemeral Postgres) |
 | Godot smoke tests (~16 files) | ALL PASS |
 | `smoke_test_network_client` (real dedicated server) | 4/4 PASS |
 | 2-player multiplayer (`run_multiplayer_2p_test.sh`) | PASS |
 | Fresh-clone boot (`verify_fresh_clone.sh`) | PASS |
 | Linux + Windows exports | Build as real ELF64 / PE32+ binaries |
 ### M4 — Avatars in the game
 - Placeholder avatar pack (14 GLBs, rigged 24-bone base body + attachments)
  generated by `scripts/tools/gen_placeholder_avatars.gd`. Real art is a
  content swap — catalog paths are stable.
 - The avatar **loader was fixed** — it had never run against a real skeleton
  (`Skeleton3D.has_bone()` isn't a Godot 4 method; the bone-copy dropped the
  skin binding; attachments were parsed then discarded).
 - `avatar_visualizer.gd` **rewritten** — the old one referenced a loader API
  that never existed and didn't compile.
 - Persistence: `avatar_loadouts` table + `GET/PUT /api/avatar/loadout`
  (loadout stored as one JSON doc; server validates the envelope only).
 - Wired into gameplay: the in-world player renders as the assembled avatar
  (not a capsule); the loadout is fetched at login; "Customize Avatar" from
  the main menu saves through to the backend.
 - **Follow-up:** camera is still first-person, so the local player doesn't
  see their own avatar much (third-person is a polish item); remote players'
  avatar appearance is not replicated yet (they show as labelled capsules).
 ### M5 — Real multiplayer
 - `server.gd` **actually runs a sim now** — loads the world level, spawns a
  server player per peer, processes each peer's input queue in seq order at a
  fixed 30 Hz, broadcasts full snapshots with a per-peer `last_seq`. (The
  input queue was a no-op before.)
 - `network_client.gd` reconciliation **replays in-flight inputs** from the
  authoritative state (drops acked ones), snaps only on real drift.
 - **Server orchestration** (`backend/app/services/game_servers.py`): one
  headless Godot dedicated-server process per world, spawned on demand by
  `POST /api/worlds/{id}/join`, port-allocated, with a status-file idle
  reaper. Off by default; the playtest launcher (`checkpoint_ops.py`)
  enables it.
 - **Client play path**: world browser → `/join` → `Session` → `game.tscn`
  connects → local player predicts with collision, input forwarded, server
  position is a drift backstop, remote players render from snapshots,
  disconnect returns to the world list. Falls back to local single-player
  when the backend has no orchestration.
 - **Verified**: two real client processes each `register → /join → play`,
  hosted on an orchestrated server, see and move relative to each other
  (`run_game_multiplayer_test.sh`).
 ### Foundation Hardening
 - **Hermetic backend tests** — `cd backend && pytest` works from a clean
  checkout (auto ephemeral Postgres + migrations, torn down after); skips
  cleanly with a message if there's no Docker.
 - **Fresh-clone boot check** — `verify_fresh_clone.sh` exports a pristine
  tree, imports from scratch, boots headless, fails on any script error.
  Also fixed the root cause: a stale `.godot/global_script_class_cache.cfg`
  was committed to the repo.
 - **Real age verification** — `/register` takes a date of birth (not a
  checkbox), server computes age, 403 under 18. Still self-attested; the
  limitation and the ID-check hook are documented
  (`content_moderation.md` 5.2).
 - **Auth rate limiting** — 10 attempts / min / IP on `/register` + `/login`.
 - **CI workflow** — `.forgejo/workflows/checkpoint.yml` written, **not
  running yet**: needs the operator to enable Forgejo Actions + register a
  `host` runner (one-time; see `docs/ci.md`). Interim gate is
  `run_checkpoint_tests.py` by hand / the dashboard.
 ## Not in PC3 (planned but not started)
 - **M2** server-side world persistence
 - **M6** scripting sandbox
 - **M7** in-game editor
 - **M8** social / chat
 - **M9** economy
 - **M10** discovery
 ## Playtest
 Same as PC2 — grab the exe from the dashboard's `/checkpoints`, backend
 pointed at it. New: with multiple people in the same world you now actually
 see each other move.
@@ -1,50 +0,0 @@
 # CI
 `.gitea/workflows/checkpoint.yml` runs the full checkpoint suite
 (`scripts/run_checkpoint_tests.py`: migrations on a fresh DB, backend
 `pytest`, all Godot smoke tests, the 2-player multiplayer test, and the
 fresh-clone boot check) on **every push to `main` and every PR**.
 ## Status: live
 Set up 2026-09-05:
 - Gitea Actions enabled (`[actions] ENABLED = true` in
  `/DATA/AppData/forgejo/gitea/conf/app.ini`, container restarted; a
  timestamped `.bak` is next to it).
 - `act_runner` v0.2.13 registered as **`agp-host`** with label **`host`**
  (host execution mode — jobs run directly on the AGP box, which already
  has Docker, `~/godot/godot`, and Python). Lives in `~/act-runner/`.
 - Green on the first successful run (`d76bf4d`).
 The workflow uses **no JavaScript actions** (no `actions/checkout`), so the
 host needs no Node: checkout is a shallow `git fetch` from the local Gitea
 using the injected `${{ github.token }}`, and the suite runs in a venv the
 job builds (host Python is PEP-668 externally-managed).
 ## Make the runner permanent (one command, needs sudo)
 The runner currently runs as a plain background process — it won't survive a
 reboot. A unit file is ready at `~/act-runner/act-runner.service`:
 ```bash
 sudo cp ~/act-runner/act-runner.service /etc/systemd/system/
 sudo systemctl daemon-reload
 pkill -f 'act_runner daemon'          # stop the temporary background one
 sudo systemctl enable --now act-runner
 ```
 ## Interim / local
 ```bash
 python scripts/run_checkpoint_tests.py
 ```
 — also what `/checkpoint/<PC>` on the dashboard runs before a playtest build.
 ## Security note
 A host-mode runner executes whatever a workflow says, directly on the box,
 as `daddy` (in the `docker` group). Fine for a single-maintainer private
 repo; revisit if the repo gets outside contributors (switch to a
 docker-mode runner or an isolated VM).
@@ -7,17 +7,14 @@ to know what "run the tests" actually checked.
 Run everything below in one shot with `scripts/run_checkpoint_tests.py`.
-Last verified against `main`: 2026-08-21 — migrations + pytest + all 11
+Last verified against `main`: 2026-08-20 — full PC1 checkpoint run,
-Godot smoke tests, all clean. PC1's real playtest-found bugs (login form
+migrations + pytest + all 7 Godot smoke tests + both platform exports, all
-unreachable, 1px world cards, Play → Back losing the session) are covered
+clean. Real bugs found and fixed via real playtesting this same day (not
-by the smoke tests below so they can't silently regress. PC2 (basic
+caught by the checkpoint suite as it stood before today): the main menu
-playable world + character + movement) landed 2026-08-20/21 — see
+had no way to actually open the login/register form, the world list's
-`docs/checkpoints/` once a PC2 record exists, and the three new smoke
+cards rendered at ~1px wide once real data existed, and navigating Play →
-tests below (`smoke_test_test_level.gd`, `smoke_test_player.gd`,
+Back logged the user out despite a still-valid session. All three are now
-`smoke_test_enter_world.gd`) for what's actually verified. The avatar
+covered by the smoke tests below so they can't silently regress.
 loader/customization system (`smoke_test_avatar_system.gd`) also landed
 2026-08-21 — real glTF-based loading with graceful failure on missing
 assets, verified since `assets/avatars/*.glb` model files don't exist yet.
 ## Backend — `backend/tests/` (pytest)
@@ -56,10 +53,7 @@ these yet):
 ## Godot client — `scripts/smoke_test_*.gd`
-**12 smoke tests merged into `main`.** Ten need a live backend, one
+**7 smoke tests merged into `main`.** Each needs a live backend —
 (`smoke_test_network_client.gd`) needs a live dedicated server instead,
 and one (`smoke_test_avatar_system.gd`) needs neither — it only exercises
 local catalog/loadout/loader logic. Backend-dependent tests read
 `AGP_API_BASE_URL` env var, falling back to the
 `application/agp/api_base_url` project setting (default
 `http://127.0.0.1:8000`) if unset.
@@ -73,11 +67,6 @@ local catalog/loadout/loader logic. Backend-dependent tests read
 | `smoke_test_main_menu_ui.gd` | Instantiates `main_menu.tscn`, confirms the auth panel starts hidden, and confirms a **real signal emission** on LoginButton/RegisterButton (not calling the handler method directly) actually opens it. This is the check that would have caught 2026-08-20's real bug: the auth panel and its logic were fully correct, but nothing in the scene was ever wired to open it, so Login/Register were completely unreachable from the UI. |
 | `smoke_test_main_menu_full_flow.gd` | Full click-through: open the register form, fill it exactly as a user would, submit, confirm Play actually becomes enabled, the welcome message shows, and the auth buttons hide themselves. Calls the submit handler directly (awaited) rather than via `auth_button.pressed.emit()` — see the note at the top of the file: a synthetic `.emit()` on an `await`-using handler doesn't get driven forward reliably in `--script`/SceneTree headless mode the way real GUI input event dispatch does, confirmed by comparing direct-call vs `.emit()` behavior. Not a bug in the actual click-driven flow, just a headless-test-harness quirk to route around when writing tests. |
 | `smoke_test_main_menu_back.gd` | Regression test for Play → Back logging the user out even with a valid token still held. Registers a user, loads `main_menu.tscn` (asserts it restores the authenticated state via a real `auth_state_ready` signal wait, not a frame-count guess), clicks Play → `world_list.tscn`, clicks Back → `main_menu.tscn`, and asserts the menu is still authenticated. Checks `WelcomeLabel.is_visible_in_tree()`, not just `.visible` — the label lives inside AuthPanel, so `.visible` alone is a false positive if the panel itself is hidden (a real bug briefly present: `_show_authenticated()` hid AuthPanel while claiming the welcome label was visible, which rendered nothing). |
 | `smoke_test_test_level.gd` | Loads `scenes/worlds/test_level.tscn` directly (the level is player-agnostic and self-contained per `docs/architecture/pc2_test_level.md` §4) and confirms it has real content: 5 props, a `DirectionalLight3D` ("Sun"), and a `WorldEnvironment` — not an empty void. |
 | `smoke_test_player.gd` | Loads `scenes/game.tscn` and confirms the player exists as a real `CharacterBody3D` with a `CollisionShape3D`+shape, a `CapsuleMesh`, and spawns at the level's `PlayerSpawn` marker position. Also asserts `JUMP_VELOCITY` is positive and a `Camera3D` exists and is `current` — both were real bugs found 2026-08-20/21 (jump velocity was negative, pushing the player down instead of up; no camera existed at all, so the game was unplayable even though the character could technically move). Structural checks only — real movement/jump *direction* correctness was verified separately via a throwaway headless physics simulation during development, not by an automated test that's part of this suite. |
 | `smoke_test_enter_world.gd` | The full PC2 path end to end: register → seed a real world → load `world_list.tscn` → click the real "Enter World" button on a real card (found by walking the card's children, not by index, so it doesn't silently pass if the card layout changes) → confirms `scenes/game.tscn` actually becomes `current_scene` with the player spawned at the level's `PlayerSpawn` marker → sends a real `KEY_ESCAPE` input event (not a direct method call) and confirms it returns to `world_list.tscn`. This is the test that proves "browse → enter → walk around → leave" actually works as one continuous flow, not just that each piece works in isolation. |
 | `smoke_test_network_client.gd` | **Real two-process integration test** for `scripts/network_client.gd` (client-side prediction + reconciliation, docs/architecture/networking.md §5) — needs an actual dedicated server running first: `godot --headless --path . scenes/server.tscn &`, *not* the usual HTTP backend. Connects a real `NetworkClient` over ENet, confirms local input prediction moves the player immediately (no waiting on a round trip), confirms real snapshots arrive and get processed, then deliberately desyncs the predicted position by 9999 units and confirms the very next snapshot corrects it back — the actual proof reconciliation logic works, not just that it never had to fire. Known simplification, stated in the script's own docstring: the server's snapshot doesn't currently echo back a per-peer "last input seq processed," so reconciliation corrects against the *most recent* prediction rather than true tick-exact rollback-and-replay (docs/architecture/networking.md §5.2 step 4) — a real, scoped follow-up once the server echoes that ack, not something faked here. |
 | `smoke_test_avatar_system.gd` | Confirms `AvatarSystem` is a real autoload, the committed `assets/avatars/catalog.json` actually parses, `get_assets_for_slot("base_body")` returns real entries, an `AvatarLoadout` can set `base_body` and equip a real catalog accessory, the loadout round-trips through `to_json()`/`load_loadout_from_json()`, and — since `assets/avatars/*.glb` model files don't exist yet — that `AvatarLoader.load_base_body()` against a real catalog entry with a missing file fails *gracefully*: returns `null` and emits `load_error` rather than crashing. Visual rendering itself can't be verified until real assets exist. |
 Run (once, to build the class cache): `godot --headless --path . --import`,
 then for each smoke test: `godot --headless --path . --script
@@ -7,7 +7,7 @@ advanced_options=false
 dedicated_server=false
 custom_features=""
 export_filter="all_resources"
-include_filter="*.json"
+include_filter=""
 exclude_filter=""
 export_path="export/linux/agp-game.x86_64"
 encryption_include_filters=""
@@ -38,7 +38,7 @@ advanced_options=false
 dedicated_server=false
 custom_features=""
 export_filter="all_resources"
-include_filter="*.json"
+include_filter=""
 exclude_filter=""
 export_path="export/windows/agp-game.exe"
 encryption_include_filters=""
@@ -14,8 +14,6 @@ agp/api_base_url="http://127.0.0.1:8000"
 [autoload]
 ApiClient="*res://scripts/api_client.gd"
 AvatarSystem="*res://scripts/avatar/avatar_system.gd"
 Session="*res://scripts/session.gd"
 [display]
@@ -23,45 +21,6 @@ window/size/viewport_width=1920
 window/size/viewport_height=1080
 window/stretch/mode="canvas_items"
 [input]
 move_forward={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"location":0,"echo":false,"script":null)
 ]
 }
 move_left={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"location":0,"echo":false,"script":null)
 ]
 }
 move_right={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"location":0,"echo":false,"script":null)
 ]
 }
 move_down={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
 ]
 }
 interact={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":69,"key_label":0,"unicode":101,"location":0,"echo":false,"script":null)
 ]
 }
 toggle_build_mode={
 "deadzone": 0.5,
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194333,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
 [physics]
 ; Fixed 30 Hz sim -- the multiplayer server, client prediction, and snapshot
 ; rate all key off this. See docs/architecture/networking.md 3.1.
 common/physics_ticks_per_second=30
 [rendering]
 renderer/rendering_method="gl_compatibility"
@@ -0,0 +1 @@
@@ -1,12 +0,0 @@
 [gd_scene load_steps=2 format=3 uid="uid://avatar_customization"]
 [ext_resource type="Script" path="res://scripts/avatar_customization_screen.gd" id="1"]
 [node name="AvatarCustomization" type="Control"]
 layout_mode = 3
 anchors_preset = 15
 anchor_right = 1.0
 anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 script = ExtResource("1")
@@ -1,6 +0,0 @@
 [gd_scene load_steps=2 format=3 uid="uid://c0avpre7dev0rig"]
 [ext_resource type="Script" path="res://scripts/tools/avatar_preview.gd" id="1"]
 [node name="AvatarPreview" type="Node3D"]
 script = ExtResource("1")
@@ -1,6 +0,0 @@
 [gd_scene load_steps=2 format=3 uid="uid://bqs8xk2rig0dev"]
 [ext_resource type="Script" path="res://scripts/tools/screenshot_rig.gd" id="1"]
 [node name="ScreenshotRig" type="Node"]
 script = ExtResource("1")
@@ -1,12 +0,0 @@
 [gd_scene load_steps=4 format=3 uid="uid://game_scene_pc2"]
 [ext_resource type="Script" path="res://scripts/game.gd" id="0_game"]
 [ext_resource type="PackedScene" uid="uid://c49a36fc7db_test_level" path="res://scenes/worlds/test_level.tscn" id="1_level"]
 [ext_resource type="PackedScene" uid="uid://player_scene_001" path="res://scenes/player.tscn" id="2_player"]
 [node name="Game" type="Node3D"]
 script = ExtResource("0_game")
 [node name="Level" parent="." instance=ExtResource("1_level")]
 [node name="Player" parent="." instance=ExtResource("2_player")]
@@ -83,11 +83,11 @@ visible = false
 placeholder_text = "Email"
 size_flags_horizontal = 3
-[node name="DobEdit" type="LineEdit" parent="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox"]
+[node name="Over18Check" type="CheckBox" parent="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox"]
 layout_mode = 1
 visible = false
 text = "I am 18 or older"
 size_flags_horizontal = 3
 placeholder_text = "Date of birth (YYYY-MM-DD)"
 [node name="AuthButton" type="Button" parent="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox"]
 layout_mode = 1
@@ -112,12 +112,6 @@ layout_mode = 1
 text = "Play"
 size_flags_horizontal = 4
 [node name="CustomizeButton" type="Button" parent="CenterContainer/VBoxContainer"]
 layout_mode = 1
 text = "Customize Avatar"
 size_flags_horizontal = 4
 disabled = true
 [node name="QuitButton" type="Button" parent="CenterContainer/VBoxContainer"]
 layout_mode = 1
 text = "Quit"
@@ -126,7 +120,6 @@ size_flags_horizontal = 4
 [connection signal="pressed" from="CenterContainer/VBoxContainer/AuthButtonsRow/LoginButton" to="." method="_on_login_button_pressed"]
 [connection signal="pressed" from="CenterContainer/VBoxContainer/AuthButtonsRow/RegisterButton" to="." method="_on_register_button_pressed"]
 [connection signal="pressed" from="CenterContainer/VBoxContainer/PlayButton" to="." method="_on_play_button_pressed"]
 [connection signal="pressed" from="CenterContainer/VBoxContainer/CustomizeButton" to="." method="_on_customize_button_pressed"]
 [connection signal="pressed" from="CenterContainer/VBoxContainer/QuitButton" to="." method="_on_quit_button_pressed"]
 [connection signal="pressed" from="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthButton" to="." method="_on_auth_button_pressed"]
 [connection signal="text_submitted" from="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/UsernameEdit" to="." method="_on_auth_button_pressed"]
@@ -1,36 +0,0 @@
 [gd_scene load_steps=5 format=3 uid="uid://player_scene_001"]
 [ext_resource type="Script" path="res://scripts/player.gd" id="1_player"]
 [ext_resource type="Script" path="res://scripts/scripting/player_inventory.gd" id="2_inventory"]
 [sub_resource type="CapsuleMesh" id="CapsuleMesh1"]
 radius = 0.35
 height = 1.6
 [sub_resource type="CapsuleShape3D" id="CapsuleShape1"]
 radius = 0.35
 height = 1.6
 [node name="Player" type="CharacterBody3D"]
 collision_layer = 2
 collision_mask = 1
 script = ExtResource("1_player")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("CapsuleShape1")
 [node name="CapsuleMesh" type="MeshInstance3D" parent="."]
 mesh = SubResource("CapsuleMesh1")
 [node name="CameraPivot" type="Node3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.2, 0)
 [node name="SpringArm3D" type="SpringArm3D" parent="CameraPivot"]
 spring_length = 3.5
 margin = 0.2
 [node name="Camera3D" type="Camera3D" parent="CameraPivot/SpringArm3D"]
 current = true
 [node name="Inventory" type="Node" parent="."]
 script = ExtResource("2_inventory")
@@ -1,6 +0,0 @@
 [gd_scene load_steps=2 format=3]
 [ext_resource type="Script" path="res://scripts/server.gd" id="1_server"]
 [node name="Server" type="Node"]
 script = ExtResource("1_server")
@@ -1,15 +0,0 @@
 [gd_scene load_steps=3 format=3]
 [ext_resource type="Script" path="res://scripts/player_spawner.gd" id="1"]
 [sub_resource type="CapsuleShape3D" id="CapsuleShape_server_player"]
 radius = 0.35
 height = 1.6
 [node name="Player" type="CharacterBody3D"]
 collision_layer = 2
 collision_mask = 1
 script = ExtResource("1")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="."]
 shape = SubResource("CapsuleShape_server_player")
@@ -1,141 +0,0 @@
 [gd_scene load_steps=2 format=3 uid="uid://c49a36fc7db_test_level"]
 [ext_resource type="Script" path="res://scripts/scripting/script_interpreter.gd" id="1_scripted_chest"]
 [sub_resource type="BoxShape3D" id="BoxShape3D_ground"]
 size = Vector3(40, 1, 40)
 [sub_resource type="BoxMesh" id="BoxMesh_ground"]
 size = Vector3(40, 1, 40)
 [sub_resource type="BoxShape3D" id="BoxShape3D_prop1"]
 size = Vector3(2, 3, 2)
 [sub_resource type="BoxMesh" id="BoxMesh_prop1"]
 size = Vector3(2, 3, 2)
 [sub_resource type="BoxShape3D" id="BoxShape3D_prop2"]
 size = Vector3(3, 1, 3)
 [sub_resource type="BoxMesh" id="BoxMesh_prop2"]
 size = Vector3(3, 1, 3)
 [sub_resource type="CylinderShape3D" id="CylinderShape3D_prop3"]
 top_radius = 1.0
 height = 4.0
 [sub_resource type="CylinderMesh" id="CylinderMesh_prop3"]
 top_radius = 1.0
 bottom_radius = 1.0
 height = 4.0
 subdivisions_top_radius = 8
 [sub_resource type="SphereShape3D" id="SphereShape3D_prop4"]
 radius = 1.0
 [sub_resource type="SphereMesh" id="SphereMesh_prop4"]
 radius = 1.0
 subdivisions_ring = 12
 subdivisions_height = 12
 [sub_resource type="SphereShape3D" id="SphereShape3D_prop5"]
 radius = 0.5
 [sub_resource type="SphereMesh" id="SphereMesh_prop5"]
 radius = 0.5
 subdivisions_ring = 8
 subdivisions_height = 8
 [sub_resource type="BoxShape3D" id="BoxShape3D_chest"]
 size = Vector3(1, 0.8, 0.6)
 [sub_resource type="BoxMesh" id="BoxMesh_chest"]
 size = Vector3(1, 0.8, 0.6)
 [sub_resource type="Environment" id="WorldEnvironment_env"]
 background_mode = 1
 background_color = Color(0.45, 0.62, 0.82, 1)
 ambient_light_source = 2
 ambient_light_color = Color(0.7, 0.75, 0.82, 1)
 ambient_light_energy = 0.8
 [node name="TestLevel" type="Node3D"]
 [node name="Ground" type="StaticBody3D" parent="."]
 position = Vector3(0, -0.5, 0)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Ground"]
 shape = SubResource("BoxShape3D_ground")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Ground"]
 mesh = SubResource("BoxMesh_ground")
 [node name="Props" type="Node3D" parent="."]
 [node name="Prop1_Box" type="StaticBody3D" parent="Props"]
 position = Vector3(8, 1.5, 8)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Props/Prop1_Box"]
 shape = SubResource("BoxShape3D_prop1")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Props/Prop1_Box"]
 mesh = SubResource("BoxMesh_prop1")
 [node name="Prop2_Pedestal" type="StaticBody3D" parent="Props"]
 position = Vector3(-8, 0.5, 6)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Props/Prop2_Pedestal"]
 shape = SubResource("BoxShape3D_prop2")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Props/Prop2_Pedestal"]
 mesh = SubResource("BoxMesh_prop2")
 [node name="Prop3_Column" type="StaticBody3D" parent="Props"]
 position = Vector3(6, 2.0, -8)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Props/Prop3_Column"]
 shape = SubResource("CylinderShape3D_prop3")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Props/Prop3_Column"]
 mesh = SubResource("CylinderMesh_prop3")
 [node name="Prop4_Sphere" type="StaticBody3D" parent="Props"]
 position = Vector3(-6, 1.0, -6)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Props/Prop4_Sphere"]
 shape = SubResource("SphereShape3D_prop4")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Props/Prop4_Sphere"]
 mesh = SubResource("SphereMesh_prop4")
 [node name="Prop5_SmallSphere" type="StaticBody3D" parent="Props"]
 position = Vector3(0, 0.5, 12)
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Props/Prop5_SmallSphere"]
 shape = SubResource("SphereShape3D_prop5")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="Props/Prop5_SmallSphere"]
 mesh = SubResource("SphereMesh_prop5")
 [node name="ScriptedChest" type="StaticBody3D" parent="."]
 position = Vector3(0, 1.0, 1.5)
 script = ExtResource("1_scripted_chest")
 behavior_path = "res://assets/scripting/behaviors/demo_chest.json"
 interact_radius = 2.5
 [node name="CollisionShape3D" type="CollisionShape3D" parent="ScriptedChest"]
 shape = SubResource("BoxShape3D_chest")
 [node name="MeshInstance3D" type="MeshInstance3D" parent="ScriptedChest"]
 mesh = SubResource("BoxMesh_chest")
 [node name="Sun" type="DirectionalLight3D" parent="."]
 rotation = Vector3(-0.95, -0.5, 0)
 light_energy = 1.3
 shadow_enabled = true
 [node name="WorldEnvironment" type="WorldEnvironment" parent="."]
 environment = SubResource("WorldEnvironment_env")
 [node name="PlayerSpawn" type="Marker3D" parent="."]
 position = Vector3(0, 1.5, 0)
@@ -69,16 +69,6 @@ func clear_token() -> void:
 var _base_url: String = "http://127.0.0.1:8000"
 ## Read-only access to the configured backend base URL (no trailing slash).
 ## Lets other client-side code that needs to build its own request outside
 ## the [method request] primitive -- e.g. [HttpChunkSource], which needs raw
 ## response bytes and custom headers `request()`'s JSON-only contract can't
 ## give it -- target the same backend without duplicating the env var /
 ## ProjectSettings resolution logic in `_ready()`.
 var base_url: String:
 	get:
 		return _base_url
 ## Request timeout in seconds. 0 disables the timeout.
 var timeout_seconds: float = 10.0
@@ -188,19 +178,18 @@ func login(username: String, password: String) -> Dictionary:
 ## Register a new user. On success stores the returned access token.
-## @param date_of_birth ISO "YYYY-MM-DD". The backend computes age from it
+## @param over_18 Must be true; the backend rejects registration otherwise.
 ##                       and rejects under-18s (403).
 func register(
 	username: String,
 	email: String,
 	password: String,
-	date_of_birth: String
+	over_18: bool
 ) -> Dictionary:
 	var payload := {
 		"username": username,
 		"email": email,
 		"password": password,
-		"date_of_birth": date_of_birth,
+		"over_18": over_18,
 	}
 	var result := await request(
 		HTTPClient.METHOD_POST,
@@ -232,29 +221,6 @@ func get_me() -> Dictionary:
 	return await request(HTTPClient.METHOD_GET, "/api/users/me", "", "application/json", true)
 ## Fetch the current user's saved avatar loadout (requires auth).
 ## On success, result.data is {"data": <loadout dict>, "is_default": bool} --
 ## `is_default` true means the user has never customised and this is the
 ## server default.
 func get_avatar_loadout() -> Dictionary:
 	return await request(HTTPClient.METHOD_GET, "/api/avatar/loadout", "", "application/json", true)
 ## Ask the backend for a dedicated server to host [param world_id] and return
 ## its address. On success result.data is {"world_id", "host", "port"}.
 ## 503 if this backend has no game-server orchestration.
 func join_world(world_id: int) -> Dictionary:
 	return await request(HTTPClient.METHOD_POST, "/api/worlds/%d/join" % world_id, "", "application/json", true)
 ## Save (replace) the current user's avatar loadout (requires auth).
 ## @param loadout A dict in the AvatarLoadout.to_json() shape
 ##                ({"base_body": String, "slots": {...}, "skin_tone"?: {...}}).
 func save_avatar_loadout(loadout: Dictionary) -> Dictionary:
 	var body := JSON.stringify({"data": loadout})
 	return await request(HTTPClient.METHOD_PUT, "/api/avatar/loadout", body, "application/json", true)
 # ---------------------------------------------------------------------------
 # Internals
 # ---------------------------------------------------------------------------
@@ -1,184 +0,0 @@
 ## AvatarCatalog - Asset catalog management.
 ##
 ## Manages the mapping of asset IDs to their metadata and resource paths.
 ## Loads the catalog manifest from disk and provides lookup by ID and slot.
 ##
 ## The catalog is loaded from `res://assets/avatars/catalog.json` which follows
 ## the format specified in avatar.md §7.2.
 class_name AvatarCatalog
 extends RefCounted
 # Preloaded rather than referenced by global class_name -- see avatar_loadout.gd.
 const AvatarLoadout := preload("res://scripts/avatar/avatar_loadout.gd")
 ## Emitted when the catalog is loaded successfully.
 signal catalog_loaded
 ## Emitted when the catalog fails to load.
 signal catalog_load_failed(error_message: String)
 ## Catalog manifest structure:
 ## { "assets": { "id": { "type", "slot", "path", "version", ... } } }
 var _catalog: Dictionary = {}
 var _loaded: bool = false
 var _catalog_path: String = "res://assets/avatars/catalog.json"
 # ---------------------------------------------------------------------------
 # Public API
 # ---------------------------------------------------------------------------
 ## Load the catalog from disk. Call this before any lookups.
 func load_catalog(path: String = _catalog_path) -> Error:
 	_catalog_path = path
 	_catalog = {}
 	var file = FileAccess.open(path, FileAccess.READ)
 	if file == null:
 		var err = FileAccess.get_open_error()
 		catalog_load_failed.emit("Cannot open catalog: %s (error %d)" % [path, err])
 		return err
 	var json_text: String = file.get_as_text()
 	file.close()
 	var result: Variant = JSON.parse_string(json_text)
 	if result == null or not result is Dictionary:
 		catalog_load_failed.emit("Invalid JSON in catalog: %s" % path)
 		return ERR_PARSE_ERROR
 	var json: Dictionary = result as Dictionary
 	if not json.has("assets"):
 		catalog_load_failed.emit("Catalog missing 'assets' key")
 		return ERR_INVALID_DATA
 	_catalog = json["assets"]
 	_loaded = true
 	catalog_loaded.emit()
 	return OK
 ## Check if the catalog has been loaded.
 func is_loaded() -> bool:
 	return _loaded
 ## Resolve an asset by its ID.
 ## Returns a Dictionary with keys: type, slot, path, version, etc.
 ## Returns null if the asset ID is not found.
 func resolve(id: String) -> Dictionary:
 	if not _loaded:
 		return {}
 	return _catalog.get(id, {})
 ## Check if an asset ID exists in the catalog.
 func has_asset(id: String) -> bool:
 	if not _loaded:
 		return false
 	return _catalog.has(id)
 ## Get all assets that belong to a given slot.
 ## Returns an array of asset ID strings.
 func get_assets_by_slot(slot: String) -> Array[String]:
 	if not _loaded:
 		return []
 	var result: Array[String] = []
 	for id in _catalog:
 		var asset: Dictionary = _catalog[id]
 		if asset.get("slot") == slot:
 			result.append(id)
 	return result
 ## Get all asset IDs in the catalog.
 func get_all_ids() -> Array[String]:
 	if not _loaded:
 		return []
 	return _catalog.keys()
 ## Validate a loadout against the catalog.
 ## Returns a Dictionary with "valid" (bool) and "errors" (Array[String]).
 func validate_loadout(loadout: AvatarLoadout) -> Dictionary:
 	var errors: Array[String] = []
 	# Check base_body
 	if loadout.base_body.is_empty():
 		errors.append("Loadout missing base_body")
 	elif not has_asset(loadout.base_body):
 		errors.append("Unknown base_body asset: %s" % loadout.base_body)
 	else:
 		var base: Dictionary = resolve(loadout.base_body)
 		if base.get("type") != "base_body":
 			errors.append("base_body asset '%s' is not type 'base_body'" % loadout.base_body)
 	# Check each slot
 	for slot_id in loadout.slots:
 		var slot_value = loadout.slots[slot_id]
 		if slot_value == null:
 			continue
 		if slot_id == "accessory":
 			# Accessory is an array
 			if not slot_value is Array:
 				errors.append("Slot '%s' must be an array" % slot_id)
 				continue
 			for item_id in slot_value:
 				if not has_asset(item_id):
 					errors.append("Unknown accessory asset: %s" % item_id)
 				else:
 					var asset: Dictionary = resolve(item_id)
 					if asset.get("slot") != slot_id:
 						errors.append("Accessory '%s' slot '%s' does not match slot '%s'" % [
 							item_id, asset.get("slot"), slot_id
 						])
 		else:
 			# Exclusive slot - single value
 			if not slot_value is String:
 				errors.append("Slot '%s' must be a string or null" % slot_id)
 				continue
 			if not has_asset(slot_value):
 				errors.append("Unknown asset in slot '%s': %s" % [slot_id, slot_value])
 			else:
 				var asset: Dictionary = resolve(slot_value)
 				if asset.get("slot") != slot_id:
 					errors.append("Asset '%s' slot '%s' does not match slot '%s'" % [
 						slot_value, asset.get("slot"), slot_id
 					])
 	return {
 		"valid": errors.is_empty(),
 		"errors": errors
 	}
 ## Compute a hash of the loadout for change detection.
 ## Returns a 32-bit hash value (GDScript has no fixed-width uint type — int
 ## is 64-bit signed, the value is just constrained to 32 bits of range).
 static func compute_loadout_hash(loadout: AvatarLoadout) -> int:
 	var hasher = HashingContext.new()
 	hasher.start(HashingContext.HASH_SHA256)
 	hasher.update(loadout.base_body.to_utf8_buffer())
 	for slot_id in loadout.slots:
 		var slot_value = loadout.slots[slot_id]
 		hasher.update(slot_id.to_utf8_buffer())
 		if slot_value is Array:
 			for item in slot_value:
 				hasher.update(item.to_utf8_buffer())
 		elif slot_value is String:
 			hasher.update(slot_value.to_utf8_buffer())
 	var hash_bytes = hasher.finish()
 	return hash_bytes[0] | (hash_bytes[1] << 8) | (hash_bytes[2] << 16) | (hash_bytes[3] << 24)
 ## Get the catalog path.
 func get_catalog_path() -> String:
 	return _catalog_path
--- a/Show More
+++ b/Show More