docs(checkpoints): PC4 scope, test plan, and capabilities documentation

docs/checkpoints/PC4.md

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+# Package Checkpoint 4 (PC4) — "A world you can build and be social in"
+
+> **Status: Complete & Verified.** PC4 delivers the integrated multi-user social world platform: in-game building and persistence (M2, M7), comprehensive social graph, chat, and presence (M8), virtual economy, marketplace, and creator payouts (M9), and home discovery with search, category filtering, and trending heuristics (M10).
+
+Built and verified by the Antigravity fleet, branch `agent/2b4212c24690-pc4-checkpoint` → `main`.
+
+---
+
+## 1. What's Real and Verified (`scripts/run_checkpoint_tests.py`)
+
+| Check / Subsystem | Status | Verification Detail |
+|---|---|---|
+| Alembic Migrations (0001 → 0015) | PASS | Hermetic clean run, head revision `0015_add_discovery_metadata` |
+| Backend API Test Suite | PASS | 100+ tests across auth, worlds, social, chat, wallet, marketplace, discovery |
+| Godot Headless Smoke Tests | PASS | 20+ headless smoke suites covering all UIs, network, avatars, economy, discovery |
+| 2-Player Multiplayer (`run_multiplayer_2p_test.sh`) | PASS | Real dedicated server + 2 simultaneous Godot client processes |
+| Fresh-Clone Boot (`verify_fresh_clone.sh`) | PASS | Clean clone imports, compiles, and boots without script errors |
+| Windows Desktop .exe Export | PASS | Packaged release binary with baked-in backend endpoint via `checkpoint_ops.py` |
+
+---
+
+## 2. Milestone Capabilities Included
+
+### M2 & M7 — World Persistence & In-Game Editor
+- **Server Persistence**: World rooms, chunk coordinates (cx, cy, cz), binary chunk payload codec, chunk revision audit trail.
+- **In-Game Editor**: Tools (Brush, Erase, Object Placement, Select, Transform), chunk edit model, undo/redo stack, non-blocking HTTP chunk saving.
+
+### M8 — Social: Friends, Presence, Chat, Groups & Profiles
+- **Social Graph**: Friend requests (pending, accepted, declined), follow/unfollow, bidirectional block enforcement.
+- **Presence & Status**: Real-time Redis-backed heartbeats with custom status messages, friends presence queries.
+- **Chat System**: 1-on-1 direct messaging, in-world spatial chat, chat moderation report queue with profanity filtering.
+- **Groups**: Group creation, membership roles (owner, admin, member), member management, group transfer.
+- **Public Profiles**: Bio, custom avatar rendering, favorite worlds listing, privacy controls.
+- **WebSocket Gateway**: Dual endpoint (`/api/ws`, `/v1/ws`) broadcasting presence and real-time chat messages.
+- **Godot Client & UIs**: `FriendsPresenceUI`, `ChatUI`, `ProfileUI`, `GroupsUI`.
+
+### M9 — Economy: Wallets, Marketplace & Creator Payouts
+- **Wallets & Ledger**: Double-entry accounting for balance credits, debits, transfers, and escrow.
+- **Purchases**: `PaymentProvider` abstraction with simulated and external payment confirmations.
+- **Marketplace**: Catalog item models, active listings, 30/70 platform/creator fee splits with atomic escrow settlement.
+- **Creator Payouts**: Payout request lifecycle (`pending` → `approved` / `rejected` → `paid`), admin audit review.
+- **Godot Client & UIs**: `WalletUI` (balance & transaction history), `MarketplaceUI` (browse & buy), `SellingPayoutUI` (create listings & request payouts).
+
+### M10 — Discovery: Browse, Search & Home Feed
+- **World Discovery Metadata**: Categories, tags (ARRAY with GIN indexing), play count, and last played timestamp.
+- **Visit Tracking**: Atomic increment of `play_count` and `world_visits` log with request deduplication.
+- **Browse & Search API**: Full-text name ILIKE query, category exact match, tag overlap (`&&`), sorting (`newest`, `most_played`, `trending`).
+- **Trending Heuristic**: Time-decay weighted scoring over recent visits (last 24h: 3x, 3d: 2x, 7d: 1x) via single aggregate outer-join query.
+- **Godot Client & UI**: `DiscoveryApiClient` and `DiscoveryUI` (`scenes/discovery_ui.tscn`) with live search, dropdown filters, pagination, and one-click world entry.
+
+---
+
+## 3. Playtest Guide
+
+1. **Dashboard Start**:
+   - Open http://localhost:7070/checkpoints
+   - Locate **PC4: A world you can build and be social in**
+   - Click **Start Backend** (launches backend on `:28004`, Postgres on `:25544`, ENet game servers on `27100–27149`)
+   - The backend automatically seeds the `playtester` account and 5 sample worlds across categories.
+2. **Download & Play**:
+   - Click **Download Windows .exe**
+   - Launch `agp-game.exe` (automatically targets the PC4 backend instance)
+   - Browse the **Discover** tab to see curated, trending, and categorized worlds
+   - Enter worlds, socialize, chat, trade in the marketplace, and build.

scenes/discovery_ui.tscn

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+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/discovery_ui.gd" id="1_disc"]
+
+[node name="DiscoveryUI" 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_disc")
+
+[node name="VBox" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = 32.0
+offset_top = 24.0
+offset_right = -32.0
+offset_bottom = -24.0
+grow_horizontal = 2
+grow_vertical = 2
+theme_override_constants/separation = 12
+
+[node name="Header" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 16
+
+[node name="BackButton" type="Button" parent="VBox/Header"]
+custom_minimum_size = Vector2(100, 36)
+layout_mode = 2
+text = "< Back"
+
+[node name="TitleLabel" type="Label" parent="VBox/Header"]
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_font_sizes/font_size = 26
+text = "Discover Experiences"
+horizontal_alignment = 1
+
+[node name="RefreshButton" type="Button" parent="VBox/Header"]
+custom_minimum_size = Vector2(100, 36)
+layout_mode = 2
+text = "Refresh"
+
+[node name="StatusLabel" type="Label" parent="VBox"]
+visible = false
+layout_mode = 2
+theme_override_colors/font_color = Color(1, 0.3, 0.3, 1)
+text = ""
+
+[node name="Filters" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 10
+
+[node name="SearchEdit" type="LineEdit" parent="VBox/Filters"]
+custom_minimum_size = Vector2(240, 36)
+layout_mode = 2
+placeholder_text = "Search by name or tag..."
+
+[node name="CategoryOption" type="OptionButton" parent="VBox/Filters"]
+custom_minimum_size = Vector2(160, 36)
+layout_mode = 2
+
+[node name="SortOption" type="OptionButton" parent="VBox/Filters"]
+custom_minimum_size = Vector2(140, 36)
+layout_mode = 2
+
+[node name="FilterButton" type="Button" parent="VBox/Filters"]
+custom_minimum_size = Vector2(90, 36)
+layout_mode = 2
+text = "Filter"
+
+[node name="Content" type="Control" parent="VBox"]
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="LoadingLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+text = "Loading experiences..."
+horizontal_alignment = 1
+
+[node name="ErrorLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+theme_override_colors/font_color = Color(1, 0.4, 0.4, 1)
+text = ""
+horizontal_alignment = 1
+
+[node name="EmptyLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+theme_override_colors/font_color = Color(0.7, 0.7, 0.7, 1)
+text = "No experiences found."
+horizontal_alignment = 1
+
+[node name="Scroll" type="ScrollContainer" parent="VBox/Content"]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="WorldsVBox" type="VBoxContainer" parent="VBox/Content/Scroll"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+theme_override_constants/separation = 10
+
+[node name="Pagination" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 16
+alignment = 1
+
+[node name="PrevButton" type="Button" parent="VBox/Pagination"]
+custom_minimum_size = Vector2(90, 32)
+layout_mode = 2
+text = "< Prev"
+
+[node name="PageLabel" type="Label" parent="VBox/Pagination"]
+layout_mode = 2
+text = "Page 1 of 1"
+horizontal_alignment = 1
+
+[node name="NextButton" type="Button" parent="VBox/Pagination"]
+custom_minimum_size = Vector2(90, 32)
+layout_mode = 2
+text = "Next >"

scripts/discovery_ui.gd

@@ -0,0 +1,376 @@
+extends Control
+class_name DiscoveryUI
+## Discovery & Home Screen for browsing, searching, and entering experiences.
+##
+## docs/planning/discovery.md (task b77bddf31ba5).
+
+signal back_requested
+signal world_selected(world_id: int)
+signal worlds_loaded(count: int)
+
+@onready var back_button: Button = $VBox/Header/BackButton
+@onready var refresh_button: Button = $VBox/Header/RefreshButton
+@onready var status_label: Label = $VBox/StatusLabel
+
+# Filter Controls
+@onready var search_edit: LineEdit = $VBox/Filters/SearchEdit
+@onready var category_option: OptionButton = $VBox/Filters/CategoryOption
+@onready var sort_option: OptionButton = $VBox/Filters/SortOption
+@onready var filter_button: Button = $VBox/Filters/FilterButton
+
+# Content
+@onready var loading_label: Label = $VBox/Content/LoadingLabel
+@onready var error_label: Label = $VBox/Content/ErrorLabel
+@onready var empty_label: Label = $VBox/Content/EmptyLabel
+@onready var worlds_container: VBoxContainer = $VBox/Content/Scroll/WorldsVBox
+
+# Pagination
+@onready var prev_button: Button = $VBox/Pagination/PrevButton
+@onready var next_button: Button = $VBox/Pagination/NextButton
+@onready var page_label: Label = $VBox/Pagination/PageLabel
+
+var _api_client: Node = null
+var _current_page: int = 0
+var _page_size: int = 10
+var _total_count: int = 0
+var _loaded_worlds: Array[DiscoveryApiClient.WorldSummary] = []
+
+
+func _ready() -> void:
+	_api_client = _get_api()
+	_wire_signals()
+	_setup_sort_options()
+	_setup_initial_ui_state()
+
+	# Populate categories then load initial worlds feed
+	await load_categories()
+	await load_worlds(0)
+
+
+func _get_api() -> Node:
+	if has_node("/root/ApiClient"):
+		return get_node("/root/ApiClient")
+	var api_script = load("res://scripts/api_client.gd")
+	if api_script:
+		var api = api_script.new()
+		add_child(api)
+		return api
+	return null
+
+
+func _setup_initial_ui_state() -> void:
+	if loading_label: loading_label.visible = false
+	if error_label: error_label.visible = false
+	if empty_label: empty_label.visible = false
+	if prev_button: prev_button.disabled = true
+	if next_button: next_button.disabled = true
+	if page_label: page_label.text = "Page 1"
+
+
+func _setup_sort_options() -> void:
+	if not sort_option:
+		return
+	sort_option.clear()
+	sort_option.add_item("Newest", 0)
+	sort_option.add_item("Most Played", 1)
+	sort_option.add_item("Trending", 2)
+	sort_option.selected = 0
+
+
+func _wire_signals() -> void:
+	if back_button and not back_button.pressed.is_connected(_on_back_pressed):
+		back_button.pressed.connect(_on_back_pressed)
+	if refresh_button and not refresh_button.pressed.is_connected(_on_refresh_pressed):
+		refresh_button.pressed.connect(_on_refresh_pressed)
+	if filter_button and not filter_button.pressed.is_connected(_on_filter_pressed):
+		filter_button.pressed.connect(_on_filter_pressed)
+	if search_edit and not search_edit.text_submitted.is_connected(_on_search_submitted):
+		search_edit.text_submitted.connect(_on_search_submitted)
+	if category_option and not category_option.item_selected.is_connected(_on_category_selected):
+		category_option.item_selected.connect(_on_category_selected)
+	if sort_option and not sort_option.item_selected.is_connected(_on_sort_selected):
+		sort_option.item_selected.connect(_on_sort_selected)
+	if prev_button and not prev_button.pressed.is_connected(_on_prev_page_pressed):
+		prev_button.pressed.connect(_on_prev_page_pressed)
+	if next_button and not next_button.pressed.is_connected(_on_next_page_pressed):
+		next_button.pressed.connect(_on_next_page_pressed)
+
+
+func load_categories() -> void:
+	if not category_option:
+		return
+	category_option.clear()
+	category_option.add_item("All Categories", 0)
+
+	if _api_client == null:
+		return
+
+	var res: Dictionary = await DiscoveryApiClient.get_categories(_api_client)
+	if res.ok and res.data is Array:
+		var idx := 1
+		for cat in res.data:
+			var cat_str := str(cat).strip_edges()
+			if cat_str != "":
+				category_option.add_item(cat_str, idx)
+				idx += 1
+
+
+func load_worlds(page: int = 0) -> void:
+	_current_page = page
+	if loading_label: loading_label.visible = true
+	if error_label: error_label.visible = false
+	if empty_label: empty_label.visible = false
+
+	var q := search_edit.text.strip_edges() if search_edit else ""
+	var category := ""
+	if category_option and category_option.selected > 0:
+		category = category_option.get_item_text(category_option.selected)
+
+	var sort := "newest"
+	if sort_option:
+		match sort_option.selected:
+			0: sort = "newest"
+			1: sort = "most_played"
+			2: sort = "trending"
+
+	var skip := _current_page * _page_size
+	var res: Dictionary = await DiscoveryApiClient.get_worlds(
+		_api_client,
+		q,
+		[],
+		category,
+		sort,
+		skip,
+		_page_size
+	)
+
+	if loading_label: loading_label.visible = false
+
+	if not res.ok:
+		if error_label:
+			error_label.text = "Error: %s" % res.detail
+			error_label.visible = true
+		_clear_container()
+		return
+
+	var parsed: DiscoveryApiClient.DiscoveryResult = res.get("parsed")
+	if parsed == null and res.data is Dictionary:
+		parsed = DiscoveryApiClient.DiscoveryResult.from_dict(res.data)
+
+	if parsed == null:
+		if error_label:
+			error_label.text = "Invalid discovery response"
+			error_label.visible = true
+		_clear_container()
+		return
+
+	_total_count = parsed.total
+	_loaded_worlds = parsed.items
+
+	_render_worlds(_loaded_worlds)
+	_update_pagination()
+	worlds_loaded.emit(_loaded_worlds.size())
+
+
+func _clear_container() -> void:
+	if not worlds_container:
+		return
+	for c in worlds_container.get_children():
+		worlds_container.remove_child(c)
+		c.queue_free()
+
+
+func _render_worlds(worlds: Array[DiscoveryApiClient.WorldSummary]) -> void:
+	_clear_container()
+
+	if worlds.is_empty():
+		if empty_label:
+			empty_label.text = "No experiences found matching your criteria."
+			empty_label.visible = true
+		return
+
+	if empty_label: empty_label.visible = false
+
+	for world in worlds:
+		var card := _create_world_card(world)
+		worlds_container.add_child(card)
+
+
+func _create_world_card(world: DiscoveryApiClient.WorldSummary) -> Control:
+	var panel := PanelContainer.new()
+	panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	panel.custom_minimum_size = Vector2(0, 90)
+
+	var style := StyleBoxFlat.new()
+	style.bg_color = Color(0.14, 0.16, 0.20, 1.0)
+	style.corner_radius_top_left = 6
+	style.corner_radius_top_right = 6
+	style.corner_radius_bottom_left = 6
+	style.corner_radius_bottom_right = 6
+	style.content_margin_left = 16
+	style.content_margin_right = 16
+	style.content_margin_top = 10
+	style.content_margin_bottom = 10
+	panel.add_theme_stylebox_override("panel", style)
+
+	var vbox := VBoxContainer.new()
+	vbox.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	vbox.add_theme_constant_override("separation", 4)
+	panel.add_child(vbox)
+
+	# Title & Category Row
+	var title_row := HBoxContainer.new()
+	var name_label := Label.new()
+	name_label.text = world.name
+	name_label.add_theme_font_size_override("font_size", 18)
+	name_label.add_theme_color_override("font_color", Color(1.0, 1.0, 1.0, 1.0))
+	title_row.add_child(name_label)
+
+	if world.category != "":
+		var cat_label := Label.new()
+		cat_label.text = "  [%s]" % world.category
+		cat_label.add_theme_font_size_override("font_size", 14)
+		cat_label.add_theme_color_override("font_color", Color(0.4, 0.7, 1.0, 1.0))
+		title_row.add_child(cat_label)
+
+	var spacer := Control.new()
+	spacer.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	title_row.add_child(spacer)
+
+	# Enter World Button
+	var enter_button := Button.new()
+	enter_button.text = "Enter World"
+	enter_button.custom_minimum_size = Vector2(110, 30)
+	enter_button.pressed.connect(_on_enter_world_pressed.bind(world.id, enter_button))
+	title_row.add_child(enter_button)
+	vbox.add_child(title_row)
+
+	# Description
+	var desc_label := Label.new()
+	desc_label.text = world.description if world.description != "" else "No description provided."
+	desc_label.autowrap_mode = TextServer.AUTOWRAP_WORD
+	desc_label.add_theme_font_size_override("font_size", 13)
+	desc_label.add_theme_color_override("font_color", Color(0.75, 0.75, 0.75, 1.0))
+	vbox.add_child(desc_label)
+
+	# Metadata Row: Tags, Plays, Owner
+	var meta_row := HBoxContainer.new()
+	meta_row.add_theme_constant_override("separation", 16)
+
+	var play_label := Label.new()
+	play_label.text = "%d plays" % world.play_count
+	play_label.add_theme_font_size_override("font_size", 12)
+	play_label.add_theme_color_override("font_color", Color(0.6, 0.9, 0.6, 1.0))
+	meta_row.add_child(play_label)
+
+	if world.tags.size() > 0:
+		var tags_str: String = ""
+		for t in world.tags:
+			tags_str += "#" + str(t) + " "
+		var tags_label := Label.new()
+		tags_label.text = tags_str.strip_edges()
+		tags_label.add_theme_font_size_override("font_size", 12)
+		tags_label.add_theme_color_override("font_color", Color(0.8, 0.7, 0.4, 1.0))
+		meta_row.add_child(tags_label)
+
+	if world.owner_username != "":
+		var owner_label := Label.new()
+		owner_label.text = "Creator: %s" % world.owner_username
+		owner_label.add_theme_font_size_override("font_size", 12)
+		owner_label.add_theme_color_override("font_color", Color(0.6, 0.6, 0.6, 1.0))
+		meta_row.add_child(owner_label)
+
+	vbox.add_child(meta_row)
+
+	return panel
+
+
+func _update_pagination() -> void:
+	var total_pages := int(ceil(float(_total_count) / float(_page_size)))
+	if total_pages <= 0:
+		total_pages = 1
+
+	if page_label:
+		page_label.text = "Page %d of %d (%d experiences)" % [_current_page + 1, total_pages, _total_count]
+
+	if prev_button:
+		prev_button.disabled = (_current_page <= 0)
+	if next_button:
+		next_button.disabled = ((_current_page + 1) >= total_pages)
+
+
+func _on_enter_world_pressed(world_id: int, button: Button) -> void:
+	button.disabled = true
+	button.text = "Joining…"
+	world_selected.emit(world_id)
+
+	# 1. Record visit metric
+	if _api_client != null:
+		await DiscoveryApiClient.record_visit(_api_client, world_id)
+
+	# 2. Join flow (existing game server orchestration)
+	if _api_client != null and _api_client.has_method("join_world"):
+		var result: Dictionary = await _api_client.join_world(world_id)
+		if result.ok and result.data is Dictionary:
+			var d: Dictionary = result.data
+			if has_node("/root/Session"):
+				get_node("/root/Session").begin(world_id, str(d.get("host", "")), int(d.get("port", 0)))
+			get_tree().change_scene_to_file("res://scenes/game.tscn")
+			return
+
+		if result.status == 503:
+			# Dev fallback: local single-player
+			if has_node("/root/Session"):
+				get_node("/root/Session").clear()
+			get_tree().change_scene_to_file("res://scenes/game.tscn")
+			return
+
+		if status_label:
+			status_label.text = "Failed to join: " + str(result.detail)
+			status_label.visible = true
+	else:
+		# Fallback if standalone test or not wired
+		if has_node("/root/Session"):
+			get_node("/root/Session").clear()
+		get_tree().change_scene_to_file("res://scenes/game.tscn")
+		return
+
+	button.disabled = false
+	button.text = "Enter World"
+
+
+func _on_filter_pressed() -> void:
+	load_worlds(0)
+
+
+func _on_search_submitted(_new_text: String) -> void:
+	load_worlds(0)
+
+
+func _on_category_selected(_index: int) -> void:
+	load_worlds(0)
+
+
+func _on_sort_selected(_index: int) -> void:
+	load_worlds(0)
+
+
+func _on_refresh_pressed() -> void:
+	load_worlds(_current_page)
+
+
+func _on_prev_page_pressed() -> void:
+	if _current_page > 0:
+		load_worlds(_current_page - 1)
+
+
+func _on_next_page_pressed() -> void:
+	var total_pages := int(ceil(float(_total_count) / float(_page_size)))
+	if (_current_page + 1) < total_pages:
+		load_worlds(_current_page + 1)
+
+
+func _on_back_pressed() -> void:
+	back_requested.emit()
+	if get_tree():
+		get_tree().change_scene_to_file("res://scenes/main_menu.tscn")

scripts/smoke_test_discovery_ui.gd

@@ -0,0 +1,89 @@
+extends SceneTree
+## Headless smoke test for DiscoveryUI.
+
+func _initialize() -> void:
+	_run()
+
+func _run() -> void:
+	print("[SMOKE] Starting DiscoveryUI smoke test...")
+	await process_frame
+
+	var scene = load("res://scenes/discovery_ui.tscn")
+	if not scene:
+		printerr("[FAIL] Could not load res://scenes/discovery_ui.tscn")
+		quit(1)
+		return
+
+	var ui: DiscoveryUI = scene.instantiate()
+	root.add_child(ui)
+	await process_frame
+
+	# 1. Verify node references
+	assert(ui.search_edit != null, "search_edit is null")
+	assert(ui.category_option != null, "category_option is null")
+	assert(ui.sort_option != null, "sort_option is null")
+	assert(ui.filter_button != null, "filter_button is null")
+	assert(ui.worlds_container != null, "worlds_container is null")
+	assert(ui.prev_button != null, "prev_button is null")
+	assert(ui.next_button != null, "next_button is null")
+	assert(ui.page_label != null, "page_label is null")
+	print("[PASS] Node references verified")
+
+	# 2. Verify sort options
+	assert(ui.sort_option.item_count == 3, "sort_option should have 3 items")
+	assert(ui.sort_option.get_item_text(0) == "Newest", "sort 0 should be Newest")
+	assert(ui.sort_option.get_item_text(1) == "Most Played", "sort 1 should be Most Played")
+	assert(ui.sort_option.get_item_text(2) == "Trending", "sort 2 should be Trending")
+	print("[PASS] Sort options verified")
+
+	# 3. Verify category dropdown initial state
+	assert(ui.category_option.item_count >= 1, "category_option should have at least All Categories")
+	assert(ui.category_option.get_item_text(0) == "All Categories", "category 0 should be All Categories")
+	print("[PASS] Category dropdown verified")
+
+	# 4. Test rendering of WorldSummary cards
+	var mock_w := DiscoveryApiClient.WorldSummary.new()
+	mock_w.id = 101
+	mock_w.name = "Cyber Nexus"
+	mock_w.category = "Action"
+	mock_w.tags = ["cyberpunk", "pvp"]
+	mock_w.play_count = 256
+	mock_w.description = "A futuristic arena"
+	mock_w.owner_username = "neon_builder"
+
+	var mock_worlds: Array[DiscoveryApiClient.WorldSummary] = [mock_w]
+	ui._render_worlds(mock_worlds)
+	assert(ui.worlds_container.get_child_count() == 1, "Should render 1 card")
+	assert(ui.empty_label.visible == false, "empty_label should be hidden when items present")
+	print("[PASS] World card rendering verified")
+
+	# 5. Test empty state
+	var empty_list: Array[DiscoveryApiClient.WorldSummary] = []
+	ui._render_worlds(empty_list)
+	assert(ui.worlds_container.get_child_count() == 0, "Container should have 0 children")
+	assert(ui.empty_label.visible == true, "empty_label should be visible when empty")
+	print("[PASS] Empty state verified")
+
+	# 6. Test pagination logic
+	ui._total_count = 25
+	ui._page_size = 10
+	ui._current_page = 0
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == true, "Page 0 prev_button should be disabled")
+	assert(ui.next_button.disabled == false, "Page 0 next_button should be enabled")
+	assert(ui.page_label.text.contains("Page 1 of 3"), "Page 1 of 3 mismatch: %s" % ui.page_label.text)
+
+	ui._current_page = 1
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == false, "Page 1 prev_button should be enabled")
+	assert(ui.next_button.disabled == false, "Page 1 next_button should be enabled")
+
+	ui._current_page = 2
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == false, "Page 2 prev_button should be enabled")
+	assert(ui.next_button.disabled == true, "Page 2 next_button should be disabled")
+	print("[PASS] Pagination logic verified")
+
+	ui.queue_free()
+	print("[SMOKE] DiscoveryUI smoke test PASSED")
+	quit(0)