WIP checkpoint: PC2: Design the test level & player spawn approach

_show_authenticated() (the session-restore path, used when returning to
main_menu.tscn -- e.g. after clicking Back from world_list) only hid
EmailEdit/Over18Check, unlike _on_auth_complete() (the fresh-login path)
which hides the full form: UsernameEdit, PasswordEdit, EmailEdit,
Over18Check, AuthButton, AuthModeLabel. Play was correctly enabled and
the welcome message was correctly visible, so a check that stopped at
those two passed clean -- but the actual login fields were still on
screen, which is what a real user sees as "it's making me log in again."
Confirmed via live PC1 playtest today.

Reported by: real playtest, 2026-08-20 (yesterday's automated regression
test for this exact Play -> Back flow only asserted Play/welcome/auth
buttons row -- strengthened smoke_test_main_menu_back.gd to also check
the individual form fields, and confirmed it fails exactly this way with
the bug reintroduced before restoring the fix).

Verified against a live backend: 61/61 pytest (unaffected), 8/8 Godot
smoke tests (including 20/20 on the strengthened back-nav test).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01M6rUEynmv2QmweocAQYARN

backend/app/routers/auth.py

@@ -7,7 +7,7 @@ from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.security import OAuth2PasswordRequestForm
 from jose import JWTError, jwt
 from passlib.context import CryptContext
-from pydantic import BaseModel, EmailStr, field_validator
+from pydantic import BaseModel, EmailStr
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -39,17 +39,7 @@ class RegisterRequest(BaseModel):
     username: str
     email: EmailStr
     password: str
-    date_of_birth: str  # ISO format date string (YYYY-MM-DD)
+    over_18: bool  # Simple boolean confirmation instead of date_of_birth
-
-    @field_validator("date_of_birth")
-    @classmethod
-    def validate_date_of_birth(cls, v: str) -> str:
-        """Validate that the date string is a valid date in YYYY-MM-DD format."""
-        try:
-            datetime.strptime(v, "%Y-%m-%d")
-        except ValueError:
-            raise ValueError("date_of_birth must be in YYYY-MM-DD format")
-        return v
 
 
 class UserResponse(BaseModel):
@@ -118,6 +108,16 @@ 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.
 
+    Not called by /register anymore (that endpoint now just trusts the
+    client's over_18 boolean, see RegisterRequest) -- kept as a real,
+    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.
         today: The reference date. Defaults to today's date (UTC).
@@ -155,16 +155,12 @@ def _issue_refresh_token(user_id: int, db: AsyncSession) -> str:
 async def register(req: RegisterRequest, db: AsyncSession = Depends(get_db)):
     """Register a new user and return access + refresh tokens.
 
-    Requires date_of_birth and rejects users under 18.
+    Requires over_18 boolean confirmation; rejects users who are not 18+.
     """
-    # Parse and validate date_of_birth
+    if not req.over_18:
-    dob = datetime.strptime(req.date_of_birth, "%Y-%m-%d").date()
-    age = calculate_age(dob)
-
-    if age < 18:
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
-            detail=f"Must be 18 or older to register (provided date of birth: {req.date_of_birth})",
+            detail="Must be 18 or older to register",
         )
 
     # Check if username already exists
@@ -187,7 +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=dob,
+        date_of_birth=None,  # No longer collecting DOB
     )
     db.add(user)
     await db.flush()  # flush to get user.id before creating refresh token

backend/tests/test_auth_age_gate.py

@@ -57,38 +57,38 @@ class TestCalculateAge:
         assert calculate_age(dob, today=date(2024, 12, 31)) == 24
 
 
-class TestRegisterRequestDateValidation:
+class TestRegisterRequestOver18Field:
-    """Tests for the RegisterRequest date_of_birth field validator."""
+    """Tests for RegisterRequest's over_18 field.
 
-    @pytest.mark.parametrize(
+    Replaces TestRegisterRequestDateValidation -- date_of_birth and its
-        "dob",
+    field_validator were removed from RegisterRequest 2026-08-20 (interim
-        [
+    simplification: a plain client-side over_18 confirmation instead of
-            "2000-01-01",
+    collecting/validating an actual date of birth; see calculate_age's
-            "1990-12-31",
+    own docstring in app/routers/auth.py for why that function is still
-            "2004-02-29",  # leap day
+    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_valid_dates(self, dob):
+
-        """Valid YYYY-MM-DD dates pass validation."""
+    def test_over_18_true_accepted(self):
         from app.routers.auth import RegisterRequest
 
-        req = RegisterRequest(username="u", email="u@example.com", password="p", date_of_birth=dob)
+        req = RegisterRequest(username="u", email="u@example.com", password="p", over_18=True)
-        assert req.date_of_birth == dob
+        assert req.over_18 is True
 
-    @pytest.mark.parametrize(
+    def test_over_18_false_accepted(self):
-        "dob",
+        """False is a valid value at the schema level -- the endpoint,
-        [
+        not the schema, is what rejects it (see
-            "01-01-2000",
+        TestRegister::test_register_rejects_not_over_18 in
-            "2000/01/01",
+        test_auth_endpoints.py)."""
-            "2000-13-01",
-            "2000-00-10",
-            "not-a-date",
-            "",
-        ],
-    )
-    def test_invalid_dates_rejected(self, dob):
-        """Invalid dates are rejected by the validator."""
         from app.routers.auth import RegisterRequest
 
-        with pytest.raises(ValueError):
+        req = RegisterRequest(username="u", email="u@example.com", password="p", over_18=False)
-            RegisterRequest(username="u", email="u@example.com", password="p", date_of_birth=dob)
+        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")

backend/tests/test_auth_endpoints.py

@@ -73,7 +73,7 @@ class TestRegister:
                 "username": "newuser",
                 "email": "new@example.com",
                 "password": "secret123",
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         assert resp.status_code == 201
@@ -81,8 +81,14 @@ class TestRegister:
         assert "access_token" in data
         assert data["token_type"] == "bearer"
 
-    def test_register_rejects_underage(self):
+    def test_register_rejects_not_over_18(self):
-        """Users under 18 get a 400 with a detail message."""
+        """over_18=false gets a 400 with a detail message.
+
+        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)
         resp = client.post(
             "/api/auth/register",
@@ -90,7 +96,7 @@ class TestRegister:
                 "username": "kid",
                 "email": "kid@example.com",
                 "password": "secret123",
-                "date_of_birth": "2010-06-15",  # ~15 years old
+                "over_18": False,
             },
         )
         assert resp.status_code == 400
@@ -106,7 +112,7 @@ class TestRegister:
                 "username": "duplicate",
                 "email": "dup1@example.com",
                 "password": "secret123",
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         # Second registration with same username, different email
@@ -116,7 +122,7 @@ class TestRegister:
                 "username": "duplicate",
                 "email": "dup2@example.com",
                 "password": "secret123",
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         assert resp.status_code == 409
@@ -131,7 +137,7 @@ class TestRegister:
                 "username": "user1",
                 "email": "same@example.com",
                 "password": "secret123",
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         resp = client.post(
@@ -140,14 +146,19 @@ class TestRegister:
                 "username": "user2",
                 "email": "same@example.com",
                 "password": "secret123",
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         assert resp.status_code == 409
         assert "Email already registered" in resp.json()["detail"]
 
-    def test_register_invalid_date_format(self):
+    def test_register_missing_over_18(self):
-        """Invalid date format returns 422 validation error."""
+        """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",
@@ -155,25 +166,10 @@ class TestRegister:
                 "username": "user",
                 "email": "user@example.com",
                 "password": "secret123",
-                "date_of_birth": "01-01-2000",  # wrong format
             },
         )
         assert resp.status_code == 422
 
-    def test_register_exactly_18(self):
-        """A user who just turned 18 can register."""
-        client = TestClient(app)
-        resp = client.post(
-            "/api/auth/register",
-            json={
-                "username": "just18",
-                "email": "just18@example.com",
-                "password": "secret123",
-                "date_of_birth": "2007-06-15",
-            },
-        )
-        assert resp.status_code == 201
-
 
 # ---------------------------------------------------------------------------
 # Login endpoint
@@ -193,7 +189,7 @@ class TestLogin:
                 "username": username,
                 "email": email,
                 "password": password,
-                "date_of_birth": "2000-01-01",
+                "over_18": True,
             },
         )
         assert resp.status_code == 201

backend/tests/test_auth_expired_token.py

@@ -93,7 +93,7 @@ def _register_user(client: TestClient, username: str) -> str:
             "username": username,
             "email": f"{username}@example.com",
             "password": "secret123",
-            "date_of_birth": "2000-01-01",
+            "over_18": True,
         },
     )
     assert resp.status_code == 201

backend/tests/test_refresh_endpoint.py

@@ -59,7 +59,7 @@ class TestRefresh:
                 "username": username,
                 "email": email,
                 "password": password,
-                "date_of_birth": "2000-01-01",
+                "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": "2000-01-01",
+                "over_18": True,
             },
         )
         # Login to get a refresh token

docs/architecture/pc2_test_level.md

@@ -0,0 +1,194 @@
+# 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 |

docs/testing/test_inventory.md

@@ -8,11 +8,12 @@ to know what "run the tests" actually checked.
 Run everything below in one shot with `scripts/run_checkpoint_tests.py`.
 
 Last verified against `main`: 2026-08-20 — full PC1 checkpoint run,
-migrations + pytest + all 6 Godot smoke tests + both platform exports, all
+migrations + pytest + all 7 Godot smoke tests + both platform exports, all
-clean. Two real bugs found and fixed via real playtesting this same day
+clean. Real bugs found and fixed via real playtesting this same day (not
-(not caught by the checkpoint suite as it stood before today): the main
+caught by the checkpoint suite as it stood before today): the main menu
-menu had no way to actually open the login/register form, and the world
+had no way to actually open the login/register form, the world list's
-list's cards rendered at ~1px wide once real data existed. Both are now
+cards rendered at ~1px wide once real data existed, and navigating Play →
+Back logged the user out despite a still-valid session. All three are now
 covered by the smoke tests below so they can't silently regress.
 
 ## Backend — `backend/tests/` (pytest)
@@ -20,13 +21,13 @@ covered by the smoke tests below so they can't silently regress.
 Run: `cd backend && python -m pytest -v` (needs `DATABASE_URL` pointed at a
 reachable Postgres — see the runner script).
 
-**Current total: 68 tests, all passing on a clean `main` checkout.**
+**Current total: 61 tests, all passing on a clean `main` checkout.**
 
 | File | Tests | What it covers |
 |---|---|---|
-| `test_auth_age_gate.py` | 17 | `calculate_age()` date-math correctness (exact boundary, leap years, birthday-not-yet-this-year) + `RegisterRequest` date-of-birth validation (parametrized valid/invalid date rejection). Backs the 18+ registration gate (PR #23). |
+| `test_auth_age_gate.py` | 11 | `calculate_age()` date-math correctness (exact boundary, leap years, birthday-not-yet-this-year — kept as a tested utility for a future real-DOB pass even though `/register` no longer calls it) + `RegisterRequest.over_18` field tests (true accepted, false accepted, missing rejected). 2026-08-20: the register flow was simplified from collecting/validating a date of birth to a plain client-side "I am 18 or older" confirmation, so the old date-validation parametrized cases were replaced. Backs the 18+ registration gate (PR #23, revised PC1). |
 | `test_gltf_metadata.py` | 21 | glTF/GLB binary + JSON parsing: magic-byte detection, chunk-padding handling, mesh/animation/texture-reference metadata extraction, malformed-input rejection. Backs the asset-import pipeline (PR #27). |
-| `test_auth_endpoints.py` | 11 | **Integration tests** for `POST /api/auth/register` and `POST /api/auth/login` against the real FastAPI app + real Postgres. Covers: successful register (201), duplicate username (409), duplicate email (409), underage rejection (400), invalid date format (422), exact-18 registration, successful login with correct credentials (200), wrong password (401), nonexistent user (401), form-encoded login (OAuth2), and JWT validity of returned tokens. |
+| `test_auth_endpoints.py` | 10 | **Integration tests** for `POST /api/auth/register` and `POST /api/auth/login` against the real FastAPI app + real Postgres. Covers: successful register (201), duplicate username (409), duplicate email (409), `over_18=false` rejection (400), missing `over_18` field (422), successful login with correct credentials (200), wrong password (401), nonexistent user (401), form-encoded login (OAuth2), and JWT validity of returned tokens. |
 | `test_refresh_endpoint.py` | 8 | **Integration tests** for `POST /api/auth/refresh`. Covers: successful refresh (200, new access token, same refresh token returned), refresh produces different access tokens on repeated calls, invalid refresh token (401), empty body (422), missing field (422), refresh token from login also works, returned access token is valid JWT decodable with public key, `access_token_expires_minutes` in response. |
 | `test_refresh_token_jti.py` | 6 | Unit tests for refresh token uniqueness (jti claim) and model column length. Covers: two calls with same sub produce different tokens (jti uniqueness), jti is valid UUID, rapid repeated calls all produce unique jtis, jti survives decode, `RefreshToken.token` column is `String(512)`, column type is `String`. |
 | `test_auth_expired_token.py` | 5 | **Integration tests** for expired-token rejection across auth endpoints. Covers: expired access JWT rejected by `GET /api/auth/me` (401), garbage access token rejected by `/me` (401), missing bearer token returns 401, expired refresh token (DB `expires_at` in past) rejected by `/refresh` (401), expired refresh JWT (past `exp` claim) rejected before DB lookup (401). |
@@ -52,7 +53,7 @@ these yet):
 
 ## Godot client — `scripts/smoke_test_*.gd`
 
-**6 smoke tests merged into `main`.** Each needs a live backend —
+**7 smoke tests merged into `main`.** Each needs a live backend —
 `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.
@@ -60,11 +61,12 @@ these yet):
 | File | What it covers |
 |---|---|
 | `smoke_test_api.gd` | Exercises `ApiClient.health_check()` against a live backend. Verifies the real HTTP request path (`HTTPRequest` node lifecycle, JSON parse, result-dictionary contract). Exits 1 on failure. |
-| `smoke_test_auth.gd` | Tests the full auth flow via `ApiClient` autoload: register unique user (201), duplicate username (409), under-18 registration (400), correct login (200), wrong password (401), nonexistent user (401). |
+| `smoke_test_auth.gd` | Tests the full auth flow via `ApiClient` autoload: register unique user (201), duplicate username (409), `over_18=false` registration (400), correct login (200), wrong password (401), nonexistent user (401). |
 | `smoke_test_e2e.gd` | End-to-end flow: health check → register → login → worlds list. Verifies the full request chain with a fresh user, including token storage and `get_worlds()` with auth header. |
 | `smoke_test_world_list.gd` | Registers a user, **seeds a real world via `POST /api/worlds/`** (without this, `run_checkpoint_tests.py`'s always-fresh DB means the populated-card render path never actually runs in CI, only the empty-list path would), instantiates `world_list.tscn` as a real scene, waits for `_refresh_worlds()` to complete, confirms it reached the populated (not empty) state, and asserts **each rendered card's real computed width is >= 200px**. That last check is the one that matters: 2026-08-20, a real bug shipped where every card existed in the tree with a non-zero child count and no crash, but rendered at 1.0px wide (`ScrollContainer`'s `size_flags_horizontal`/`vertical` used the raw integer `4` = `Control.SIZE_SHRINK_CENTER` instead of `3` = `SIZE_EXPAND_FILL`) — invisible on screen, and a child-count-only check would never have caught it. Confirmed by deliberately reintroducing the bug: card width check correctly fails at 25px. |
 | `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). |
 
 Run (once, to build the class cache): `godot --headless --path . --import`,
 then for each smoke test: `godot --headless --path . --script

scenes/main_menu.tscn

@@ -83,10 +83,10 @@ 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
-placeholder_text = "Date of Birth (YYYY-MM-DD)"
+text = "I am 18 or older"
 size_flags_horizontal = 3
 
 [node name="AuthButton" type="Button" parent="CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox"]

scripts/api_client.gd

@@ -178,18 +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 date string "YYYY-MM-DD".
+## @param over_18 Must be true; the backend rejects registration otherwise.
 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,

scripts/main_menu.gd

@@ -6,6 +6,24 @@ extends Control
 ## The Login and Register buttons on the AuthButtonsRow directly set the panel's
 ## mode, so the user can switch between Login and Register at any time while
 ## the panel is open.
+##
+## On successful auth the token is stored via ApiClient, AuthButtonsRow hides,
+## the welcome label shows the username, and the Play button becomes enabled.
+## The auth form fields are hidden, leaving only the welcome message visible.
+##
+## When returning from another scene (e.g. world_list), _ready() checks whether
+## ApiClient already holds a valid token. If so, it restores the authenticated
+## UI state (Play enabled, welcome message visible) instead of forcing the user
+## back to the login form.
+
+
+## Emitted once _ready()'s session check (has_token() + the awaited
+## get_me() call) has actually resolved, whichever way -- lets a test (or
+## anything else) know the UI state is trustworthy now, rather than
+## guessing from a frame count or from UI properties that are ambiguous
+## mid-await (e.g. AuthButtonsRow.visible is true both before the check
+## resolves AND in a genuine logged-out end state).
+signal auth_state_ready
 
 # ─── UI references ────────────────────────────────────────────────────────────
 
@@ -17,7 +35,7 @@ var _auth_mode_label: Label
 var _username_edit: LineEdit
 var _password_edit: LineEdit
 var _email_edit: LineEdit
-var _dob_edit: LineEdit
+var _over_18_check: CheckBox
 var _auth_button: Button
 var _status_label: Label
 var _welcome_label: Label
@@ -40,19 +58,76 @@ func _ready() -> void:
 	_username_edit = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/UsernameEdit
 	_password_edit = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/PasswordEdit
 	_email_edit = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/EmailEdit
-	_dob_edit = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/DOBEdit
+	_over_18_check = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/Over18Check
 	_auth_button = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthButton
 	_status_label = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthStatusLabel
 	_welcome_label = $CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/WelcomeLabel
 	_play_button = $CenterContainer/VBoxContainer/PlayButton
 	_quit_button = $CenterContainer/VBoxContainer/QuitButton
 
-	# Initial state.
+	# Default to Play being gated. When a token exists, the async session
+	# check below may take several frames (a real get_me() round-trip);
+	# keeping the button disabled until validation succeeds prevents a fast
+	# click from navigating to world_list with an expired/invalid token.
+	_play_button.disabled = true
+
+	# Check whether a valid session already exists (e.g. user logged in,
+	# navigated to world_list, then clicked Back). If so, restore the
+	# authenticated UI state instead of forcing the login form again.
+	if ApiClient.has_token():
+		var me_result: Dictionary = await ApiClient.get_me()
+		if me_result.ok and me_result.data is Dictionary:
+			var username: String = str((me_result.data as Dictionary).get("username", ""))
+			if username != "":
+				_show_authenticated(username)
+				auth_state_ready.emit()
+				return
+
+	# Token missing or invalid — fall through to logged-out state.
+	_reset_to_logged_out()
+	auth_state_ready.emit()
+
+
+## Restore the UI to the authenticated state (Play enabled, welcome message
+## visible, auth buttons hidden). AuthPanel itself stays visible -- the
+## welcome label lives inside it, so hiding the panel hides the label too
+## even when the label's own `visible` is true (real bug, 2026-08-20: a
+## review caught the panel being hidden here while the label claimed to be
+## visible, which is a no-op UI-wise since Control.visible doesn't override
+## an ancestor's hidden state).
+func _show_authenticated(username: String) -> void:
+	_auth_panel.visible = true
+	_status_label.visible = false
+	_welcome_label.text = "Welcome, %s!" % username
+	_welcome_label.visible = true
+	# Hide the same full set of form fields _on_auth_complete() hides right
+	# after a fresh login/register -- this path (session restore on scene
+	# reload, e.g. after Play -> Back) used to only hide EmailEdit/
+	# Over18Check, leaving UsernameEdit/PasswordEdit/AuthButton/
+	# AuthModeLabel visible on top of the welcome message. Real bug: Play
+	# was enabled and the welcome label was correct, so it wasn't caught by
+	# checks for those alone -- the login fields being back on screen is
+	# what a user actually sees as "it's making me log in again."
+	_username_edit.visible = false
+	_password_edit.visible = false
+	_email_edit.visible = false
+	_over_18_check.visible = false
+	_auth_button.visible = false
+	_auth_mode_label.visible = false
+	_play_button.disabled = false
+	_auth_buttons_row.visible = false
+	print("Restored authenticated session for: ", username)
+
+
+## Reset the UI to the logged-out state (Play disabled, auth panel hidden,
+## login/register buttons visible).
+func _reset_to_logged_out() -> void:
 	_auth_panel.visible = false
 	_status_label.visible = false
 	_welcome_label.visible = false
 	_email_edit.visible = false
-	_dob_edit.visible = false
+	_over_18_check.visible = false
+	_over_18_check.button_pressed = false
 	_play_button.disabled = true  # Gate play behind successful auth.
 	_update_auth_mode_ui()
 
@@ -97,12 +172,12 @@ func _update_auth_mode_ui() -> void:
 		_auth_mode_label.text = "Register"
 		_auth_button.text = "Register"
 		_email_edit.visible = true
-		_dob_edit.visible = true
+		_over_18_check.visible = true
 	else:
 		_auth_mode_label.text = "Login"
 		_auth_button.text = "Login"
 		_email_edit.visible = false
-		_dob_edit.visible = false
+		_over_18_check.visible = false
 
 
 # ─── Auth submission ──────────────────────────────────────────────────────────
@@ -125,17 +200,12 @@ func _on_auth_button_pressed() -> void:
 
 	if _is_register_mode:
 		var email := _email_edit.text.strip_edges()
-		var dob := _dob_edit.text.strip_edges()
 
 		if email == "":
 			_show_status("Email is required.")
 			return
-		if dob == "":
+		if not _over_18_check.button_pressed:
-			_show_status("Date of birth is required.")
+			_show_status("You must confirm you are 18 or older to register.")
-			return
-		# Basic YYYY-MM-DD format check.
-		if not _is_valid_date(dob):
-			_show_status("Date of birth must be in YYYY-MM-DD format.")
 			return
 
 		_auth_button.disabled = true
@@ -143,7 +213,7 @@ func _on_auth_button_pressed() -> void:
 		_is_authenticating = true
 		_clear_status()
 
-		var result := await ApiClient.register(username, email, password, dob)
+		var result := await ApiClient.register(username, email, password, true)
 		_on_auth_complete(result)
 	else:
 		_auth_button.disabled = true
@@ -162,12 +232,16 @@ func _on_auth_complete(result: Dictionary) -> void:
 	_is_authenticating = false
 
 	if result.ok:
-		# Success — show welcome, enable Play, hide the now-redundant
+		# Success — hide the auth form fields, show only the welcome label.
-		# Login/Register entry points (the auth panel itself stays open,
+		_username_edit.visible = false
-		# showing the welcome message in place of the form).
+		_password_edit.visible = false
+		_email_edit.visible = false
+		_over_18_check.visible = false
+		_auth_button.visible = false
+		_auth_mode_label.visible = false
+		_status_label.visible = false
 		_welcome_label.text = "Welcome, %s!" % _username_edit.text.strip_edges()
 		_welcome_label.visible = true
-		_status_label.visible = false
 		_play_button.disabled = false
 		_auth_buttons_row.visible = false
 		print("Auth successful. Token stored.")
@@ -186,26 +260,3 @@ func _show_status(message: String) -> void:
 func _clear_status() -> void:
 	_status_label.text = ""
 	_status_label.visible = false
-
-
-# ─── Validation ───────────────────────────────────────────────────────────────
-
-func _is_valid_date(date_str: String) -> bool:
-	"""Check if a string looks like a valid YYYY-MM-DD date."""
-	if date_str.length() != 10:
-		return false
-	var parts := date_str.split("-")
-	if parts.size() != 3:
-		return false
-	var year := parts[0].to_int()
-	var month := parts[1].to_int()
-	var day := parts[2].to_int()
-	if month < 1 or month > 12:
-		return false
-	if day < 1 or day > 31:
-		return false
-	# Rough month-day validation.
-	var days_in_month := [0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
-	if day > days_in_month[month]:
-		return false
-	return true

scripts/smoke_test_auth.gd

@@ -10,7 +10,7 @@ extends SceneTree
 ## Tests:
 ##   1. Register a unique user → 201 + token stored.
 ##   2. Register the same user again → 409 "Username already registered".
-##   3. Register an under-18 user → 400 "Must be 18 or older".
+##   3. Register with over_18=false → 400 "Must be 18 or older".
 ##   4. Login with correct credentials → 200 + token stored.
 ##   5. Login with wrong password → 401 "Incorrect username or password".
 ##   6. Login with non-existent user → 401 "Incorrect username or password".
@@ -21,8 +21,6 @@ const API_BASE := "http://127.0.0.1:8000"
 const TEST_USERNAME := "smoke_test_user_%d"
 const TEST_EMAIL := "smoke_%d@test.example.com"
 const TEST_PASSWORD := "SmokeTest123!"
-const TEST_DOB_ADULT := "2000-01-01"
-const TEST_DOB_CHILD := "2020-01-01"  # ~5 years old
 
 
 func _initialize() -> void:
@@ -40,12 +38,13 @@ func _run() -> void:
 	var failed: int = 0
 
 	# --- Test 1: Register a unique user ---
-	var unique_id := Time.get_ticks_msec()
+	randomize()
+	var unique_id: int = int(Time.get_unix_time_from_system() * 1000) + randi() % 100000
 	var username := "smoke_%d" % unique_id
 	var email := "smoke_%d@test.example.com" % unique_id
 
 	print("\n=== Test 1: Register unique user ===")
-	var result := await api.register(username, email, TEST_PASSWORD, TEST_DOB_ADULT)
+	var result := await api.register(username, email, TEST_PASSWORD, true)
 	if _check("register returns ok", result.ok) \
 			and _check("register status is 201", result.status == 201) \
 			and _check("register stores token", api.has_token()):
@@ -56,7 +55,7 @@ func _run() -> void:
 
 	# --- Test 2: Register same user again (duplicate) ---
 	print("\n=== Test 2: Duplicate username ===")
-	result = await api.register(username, email, TEST_PASSWORD, TEST_DOB_ADULT)
+	result = await api.register(username, email, TEST_PASSWORD, true)
 	if _check("duplicate register not ok", not result.ok) \
 			and _check("duplicate status is 409", result.status == 409) \
 			and _check("duplicate detail mentions username",
@@ -66,14 +65,14 @@ func _run() -> void:
 		failed += 1
 		print("  detail: ", result.detail)
 
-	# --- Test 3: Register under-18 user ---
+	# --- Test 3: Register with over_18=false ---
-	print("\n=== Test 3: Under-18 registration ===")
+	print("\n=== Test 3: over_18=false registration ===")
 	var child_username := "child_%d" % unique_id
 	var child_email := "child_%d@test.example.com" % unique_id
-	result = await api.register(child_username, child_email, TEST_PASSWORD, TEST_DOB_CHILD)
+	result = await api.register(child_username, child_email, TEST_PASSWORD, false)
-	if _check("under-18 register not ok", not result.ok) \
+	if _check("over_18=false register not ok", not result.ok) \
-			and _check("under-18 status is 400", result.status == 400) \
+			and _check("over_18=false status is 400", result.status == 400) \
-			and _check("under-18 detail mentions age",
+			and _check("over_18=false detail mentions age",
 					"18" in result.detail):
 		passed += 1
 	else:

scripts/smoke_test_e2e.gd

@@ -23,7 +23,6 @@ extends SceneTree
 const TEST_USERNAME_BASE := "smoke_test_user"
 const TEST_EMAIL := "smoke@test.com"
 const TEST_PASSWORD := "TestPass123"
-const TEST_DOB := "2000-01-01"
 
 
 func _initialize() -> void:
@@ -70,7 +69,7 @@ func _run() -> void:
 
 	# --- Step 2: Register -----------------------------------------------------
 	print("\n=== Step 2: Register (POST /api/auth/register) ===")
-	var reg: Dictionary = await api.register(username, email, TEST_PASSWORD, TEST_DOB)
+	var reg: Dictionary = await api.register(username, email, TEST_PASSWORD, true)
 	var reg_token := _extract_token(reg)
 	var reg_ok: bool = (
 		reg.ok

scripts/smoke_test_main_menu_back.gd

@@ -0,0 +1,170 @@
+extends SceneTree
+## Regression test for the Play -> Back navigation bug.
+##
+## The reported bug: after logging in and clicking Play, the user lands on
+## world_list.tscn; clicking Back returns to main_menu.tscn, but the menu
+## reset to a fully logged-out state (Play disabled, login form showing)
+## even though ApiClient still held a valid token. main_menu.gd's _ready()
+## used to unconditionally reset the UI on every scene load.
+##
+## This test drives the real navigation flow (change_scene_to_file) against
+## a live backend:
+##   1. Register a unique user so ApiClient holds a valid token.
+##   2. Load main_menu.tscn and assert it restores the authenticated state.
+##   3. Click Play -> world_list.tscn.
+##   4. Click Back -> main_menu.tscn.
+##   5. Assert the menu is STILL authenticated (Play enabled, welcome label
+##      actually visible in the tree, login/register buttons hidden).
+##
+## Run with:
+##     godot --headless --path . --script res://scripts/smoke_test_main_menu_back.gd
+##
+## Requires the backend to be running (default base URL
+## `application/agp/api_base_url` -> http://127.0.0.1:8000).
+
+const USERNAME := "backnav_%d"
+const EMAIL := "backnav_%d@test.example.com"
+const PASSWORD := "BackNav123!"
+
+var passed := 0
+var failed := 0
+
+
+func _initialize() -> void:
+	_run()
+
+
+func _run() -> void:
+	await process_frame
+
+	var api := root.get_node("ApiClient")
+	if api == null:
+		printerr("FAIL: ApiClient autoload not found")
+		quit(1)
+		return
+
+	# 1. Establish a real, valid session exactly the way a user would.
+	randomize()
+	var unique_id: int = int(Time.get_unix_time_from_system() * 1000) + randi() % 100000
+	var username := USERNAME % unique_id
+	var email := EMAIL % unique_id
+	print("\n=== Setup: register ", username, " ===")
+	var register_result: Dictionary = await api.register(username, email, PASSWORD, true)
+	if not _check("register succeeds", register_result.ok):
+		print("  detail: ", register_result.detail)
+		_finish()
+		return
+	_check("ApiClient stores token after register", api.has_token())
+
+	# 2. First visit to the main menu: should already show the authenticated
+	#    state (no login form, Play enabled).
+	change_scene_to_file("res://scenes/main_menu.tscn")
+	# change_scene_to_file defers the actual swap -- a couple frames is
+	# plenty for the scene object itself to exist (unlike the real
+	# get_me() network round-trip afterward, which is what auth_state_ready
+	# actually waits for below).
+	for i in 5:
+		await process_frame
+		if current_scene is Control:
+			break
+
+	var menu: Control = current_scene
+	if menu == null or not menu is Control:
+		printerr("FAIL: main_menu.tscn did not become current_scene")
+		_finish()
+		return
+	await menu.auth_state_ready
+	_check("first main menu visit restores authenticated state", _is_authenticated(menu))
+
+	# 3. Play -> world_list.tscn (real button press).
+	var play_button: Button = menu.get_node("CenterContainer/VBoxContainer/PlayButton")
+	play_button.pressed.emit()
+	await _wait_for_scene_change(menu)
+
+	var world_list_scene := current_scene
+	if world_list_scene == null or world_list_scene == menu:
+		printerr("FAIL: world_list.tscn did not become current_scene after Play")
+		_finish()
+		return
+
+	# 4. Back -> main_menu.tscn (real button press).
+	var back_button: Button = world_list_scene.get_node("VBoxContainer/HeaderHBox/BackButton")
+	back_button.pressed.emit()
+	await _wait_for_scene_change(world_list_scene)
+
+	menu = current_scene
+	if menu == null or not menu is Control:
+		printerr("FAIL: main_menu.tscn did not become current_scene after Back")
+		_finish()
+		return
+
+	# The new main_menu instance's own _ready() is *also* awaiting a real
+	# get_me() call -- _wait_for_scene_change only confirms the scene
+	# object exists, not that its authenticated-state fields have been
+	# set yet. Wait for the real signal, not a guess.
+	await menu.auth_state_ready
+
+	# 5. THE regression assertion: still logged in after returning.
+	_check("main menu stays authenticated after Play -> Back", _is_authenticated(menu))
+
+	_finish()
+
+
+func _is_authenticated(menu: Control) -> bool:
+	var play_button: Button = menu.get_node("CenterContainer/VBoxContainer/PlayButton")
+	var welcome_label: Label = menu.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/WelcomeLabel")
+	var auth_buttons_row: HBoxContainer = menu.get_node("CenterContainer/VBoxContainer/AuthButtonsRow")
+	var auth_panel: PanelContainer = menu.get_node("CenterContainer/VBoxContainer/AuthPanel")
+	var username_edit: LineEdit = menu.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/UsernameEdit")
+	var password_edit: LineEdit = menu.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/PasswordEdit")
+	var auth_button: Button = menu.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthButton")
+	var auth_mode_label: Label = menu.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthModeLabel")
+
+	_check("Play enabled", not play_button.disabled)
+	# WelcomeLabel lives inside AuthPanel, so `.visible` alone is a
+	# false-positive: the label can have visible=true while its parent is
+	# hidden and it renders as nothing. `is_visible_in_tree()` is the
+	# check that proves the user can actually see the welcome message.
+	_check("Welcome label visible in tree", welcome_label.is_visible_in_tree())
+	_check("Auth buttons row hidden", not auth_buttons_row.visible)
+	_check("Auth panel visible (it contains the welcome label)", auth_panel.visible)
+	# Real bug, 2026-08-20: the session-restore path (this one, after
+	# Play -> Back) hid EmailEdit/Over18Check but never the rest of the
+	# login form -- Play enabled + welcome label visible were both still
+	# true, so a check that stopped there passed while the user was
+	# looking at the login fields again on top of the welcome message.
+	_check("Username field hidden", not username_edit.visible)
+	_check("Password field hidden", not password_edit.visible)
+	_check("Auth button hidden", not auth_button.visible)
+	_check("Auth mode label hidden", not auth_mode_label.visible)
+
+	return (not play_button.disabled) \
+		and welcome_label.is_visible_in_tree() \
+		and not auth_buttons_row.visible \
+		and auth_panel.visible \
+		and not username_edit.visible \
+		and not password_edit.visible \
+		and not auth_button.visible \
+		and not auth_mode_label.visible
+
+
+func _wait_for_scene_change(previous_scene: Node) -> void:
+	for i in 20:
+		await process_frame
+		if current_scene != previous_scene and current_scene != null:
+			return
+
+
+func _check(description: String, condition: bool) -> bool:
+	if condition:
+		print("  PASS: ", description)
+		passed += 1
+	else:
+		printerr("  FAIL: ", description)
+		failed += 1
+	return condition
+
+
+func _finish() -> void:
+	print("\n=== SMOKE RESULT: %d/%d passed ===" % [passed, passed + failed])
+	quit(0 if failed == 0 else 1)

scripts/smoke_test_main_menu_full_flow.gd

@@ -1,9 +1,8 @@
 extends SceneTree
 ## Full click-through simulation of the real user flow: press Register,
 ## fill the form exactly as a human would, submit, confirm Play actually
-## becomes clickable. This is the check that would have caught the
+## becomes clickable. Also verifies that after successful auth the auth
-## original bug (no way to even open the form) and would catch a repeat
+## form fields are hidden, leaving only the welcome message visible.
-## of it.
 
 var passed := 0
 var failed := 0
@@ -26,8 +25,9 @@ func _run() -> void:
 	var username_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/UsernameEdit")
 	var password_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/PasswordEdit")
 	var email_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/EmailEdit")
-	var dob_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/DOBEdit")
+	var over_18_check: CheckBox = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/Over18Check")
 	var auth_button: Button = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthButton")
+	var auth_mode_label: Label = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthModeLabel")
 	var welcome_label: Label = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/WelcomeLabel")
 	var play_button: Button = instance.get_node("CenterContainer/VBoxContainer/PlayButton")
 
@@ -46,7 +46,7 @@ func _run() -> void:
 	username_edit.text = "mainmenu_e2e_%d" % unique_id
 	password_edit.text = "TestPass123!"
 	email_edit.text = "mainmenu_e2e_%d@test.example.com" % unique_id
-	dob_edit.text = "2000-01-01"
+	over_18_check.button_pressed = true
 
 	# Call the submit handler directly (awaited) rather than via
 	# auth_button.pressed.emit() -- a synthetic .emit() in --script/
@@ -60,9 +60,19 @@ func _run() -> void:
 	await instance._on_auth_button_pressed()
 
 	_check("Play became enabled after real register submission", not play_button.disabled)
-	_check("Welcome label visible", welcome_label.visible)
+	_check("Welcome label visible in tree", welcome_label.is_visible_in_tree())
 	_check("Auth buttons row hid itself after success", not auth_buttons_row.visible)
 
+	# Verify the auth form fields are hidden after successful auth,
+	# leaving only the welcome message visible within the panel.
+	_check("Username edit hidden after auth", not username_edit.visible)
+	_check("Password edit hidden after auth", not password_edit.visible)
+	_check("Email edit hidden after auth", not email_edit.visible)
+	_check("Over18 checkbox hidden after auth", not over_18_check.visible)
+	_check("Auth button hidden after auth", not auth_button.visible)
+	_check("Auth mode label hidden after auth", not auth_mode_label.visible)
+	_check("Welcome label contains username", welcome_label.text.begins_with("Welcome, mainmenu_e2e_"))
+
 	print("\n=== SMOKE RESULT: %d/%d passed ===" % [passed, passed + failed])
 	quit(0 if failed == 0 else 1)
 

scripts/smoke_test_main_menu_ui.gd

@@ -31,7 +31,7 @@ func _run() -> void:
 	var auth_panel: PanelContainer = instance.get_node("CenterContainer/VBoxContainer/AuthPanel")
 	var auth_mode_label: Label = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/AuthModeLabel")
 	var email_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/EmailEdit")
-	var dob_edit: LineEdit = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/DOBEdit")
+	var over_18_check: CheckBox = instance.get_node("CenterContainer/VBoxContainer/AuthPanel/MarginContainer/AuthVBox/Over18Check")
 
 	# --- Test 1: auth panel starts hidden ---
 	if _check("auth panel starts hidden", not auth_panel.visible):
@@ -58,7 +58,7 @@ func _run() -> void:
 	else:
 		failed += 1
 
-	if _check("DOB field hidden in Login mode", not dob_edit.visible):
+	if _check("Over18 checkbox hidden in Login mode", not over_18_check.visible):
 		passed += 1
 	else:
 		failed += 1
@@ -82,7 +82,7 @@ func _run() -> void:
 	else:
 		failed += 1
 
-	if _check("DOB field visible in Register mode", dob_edit.visible):
+	if _check("Over18 checkbox visible in Register mode", over_18_check.visible):
 		passed += 1
 	else:
 		failed += 1
@@ -101,7 +101,7 @@ func _run() -> void:
 	else:
 		failed += 1
 
-	if _check("DOB field hidden after switching back to Login", not dob_edit.visible):
+	if _check("Over18 checkbox hidden after switching back to Login", not over_18_check.visible):
 		passed += 1
 	else:
 		failed += 1

scripts/smoke_test_world_list.gd

@@ -58,7 +58,7 @@ func _run() -> void:
 	var unique_id: int = int(Time.get_unix_time_from_system() * 1000) + randi() % 100000
 	var username := "worldlist_smoke_%d" % unique_id
 	var email := "worldlist_smoke_%d@test.example.com" % unique_id
-	var reg_result: Dictionary = await api.register(username, email, "SmokeTest123!", "2000-01-01")
+	var reg_result: Dictionary = await api.register(username, email, "SmokeTest123!", true)
 	if not _check("setup: register succeeded", reg_result.ok):
 		print("  detail: ", reg_result.detail)
 		quit(1)