Phase 13: Rooms + Auto-roof + Beauty + Dirtiness + Cleaning

Three-agent fan-out — Opus pre-wrote Room class, World.rooms/room_at_tile/is_indoor,
4 EventBus signals before dispatch so the slices ran fully parallel.

DECISION: Big-room UX = bump auto-roof cap to 16, banner above. Cabin
(24 tiles) intentionally exceeds cap to exercise the warning path; a
5×5 test shed (9 interior tiles) was added to exercise the roof path.

Room detection (Agent A):
- scenes/world/room.gd — class_name Room, tiles/bounds/is_under_roof,
  contains_tile() bounds-then-list-checked, recompute_bounds()
- scenes/world/room_detector.gd — class_name RoomDetector, BFS 4-dir
  from floor/door tiles, walls/terrain as boundary, doors counted as
  room interior. Detects up to 4× cap; auto-roofs only ≤16.
- World.mark_wall_tile/mark_floor_tile/mark_door_tile hook BFS recompute
- Door._complete() now erases wall-layer stamp + registers door tile
- Designation.TOOL_NO_ROOF paint mode wired (UI button deferred Phase 17)
- EventBus.room_changed / room_too_large signals

Indoor/Shelter (Agent B):
- Pawn._is_sheltered() rerouted: World.is_indoor() first, floor-proxy fallback
- IndoorTintOverlay Node2D — _draw fills roofed-room tiles at α=0.10 warm
- Crop._on_sim_tick skips stage advance when World.is_indoor(tile)

Beauty + Dirtiness + Cleaning + Room thoughts (Agent C):
- BeautySystem sparse map, linear falloff radius=3, Quality multiplier
  (SHODDY 0.5 → LEGENDARY 2.5). Base: Bed +2, Workbench +1, Torch +3, Hearth +4
- DirtinessSystem 0-100, tier crossings (clean<25/dirty<60/filthy≥60)
  emit tile_dirtiness_changed. bump/bump_clean/bump_pawn_traffic API
- CleaningProvider priority=2, KIND_CLEAN toil, 2.5 dirt/tick for ~40 ticks
- Bed/Torch/Workbench _complete() now register with BeautySystem
- 7 room mood thoughts: clean_room (+2), dirty_room (-3), filthy_room (-6),
  beautiful_room (+4), ugly_room (-3), slept_in_room (+3 EVENT, wires Ph 17),
  ate_without_table (-3 EVENT, wires Ph 17)
- Pawn._sync_room_thoughts called from _process_thoughts after cold block,
  defensive against null rooms/systems

Integration recovery (Opus):
- Agent C's BeautySystem/DirtinessSystem/CleaningProvider/IndoorTintOverlay
  instantiation in world.gd never landed (only field declarations + entity
  hooks survived). Added preloads + runtime add_child + autoload bindings +
  CleaningProvider registration + furniture pre-seed in _ready
- Added _prestamp_test_shed_for_room_detector with _spawn_complete_wall/floor
  helpers so a 5×5 visible shed exercises the auto-roof path at boot

MCP runtime verified:
- Rooms: cabin Room#2 size=24 roofed=false (room_too_large fires),
  shed Room#3 size=9 roofed=true (auto-roof active)
- beauty_map size=50 around prebuilt furniture; bed at (47,24) beauty=4.0
- Bram teleported to (36, 25) in shed → indoor=true, sheltered=true,
  thoughts=[clean_room +2], mood=52.0
- Screenshot: shed walls + brown floor visible; cabin warmly torch-lit;
  Spring 1/12 indicator; Day 1 07:52

Delegation: 3× gdscript-refactor (Sonnet) agents in parallel;
integration recovery + MCP verify on Opus.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scenes/world/designation.gd

@@ -17,14 +17,19 @@ const TOOL_NONE:        StringName = &"none"
 const TOOL_BUILD_WALL:  StringName = &"build_wall"
 const TOOL_BUILD_FLOOR: StringName = &"build_floor"
 const TOOL_BUILD_DOOR:  StringName = &"build_door"
+# Phase 13 — no-roof designation: painted tiles become courtyards; RoomDetector
+# excludes them from auto-roofing.  Calls World.toggle_no_roof_at() on apply.
+const TOOL_NO_ROOF:     StringName = &"no_roof"
 
 # Atlas coords on the shared placeholder tileset (source 0).
 # build_wall → stone-grey (2, 0); build_floor → dirt-brown (1, 0).
 # build_door → dark stone (3, 0) so the ghost reads visually distinct from walls.
+# no_roof → grass (0, 0) with the designation layer modulate tinting it visibly.
 const _ATLAS_BY_TOOL: Dictionary = {
 	&"build_wall":  Vector2i(2, 0),
 	&"build_floor": Vector2i(1, 0),
 	&"build_door":  Vector2i(3, 0),
+	&"no_roof":     Vector2i(0, 0),
 }
 
 # Placeholder source ID — mirrors World.PLACEHOLDER_SOURCE_ID.
@@ -63,7 +68,7 @@ func bind(paint_layer: TileMapLayer, selection: Selection = null) -> void:
 ## Activate a paint tool.  Pass TOOL_NONE to deactivate.
 func set_active_tool(tool: StringName) -> void:
 	assert(
-		tool in [TOOL_NONE, TOOL_BUILD_WALL, TOOL_BUILD_FLOOR, TOOL_BUILD_DOOR],
+		tool in [TOOL_NONE, TOOL_BUILD_WALL, TOOL_BUILD_FLOOR, TOOL_BUILD_DOOR, TOOL_NO_ROOF],
 		"Designation.set_active_tool: unknown tool '%s'" % tool
 	)
 	_tool = tool
@@ -153,6 +158,13 @@ func _apply_ghost(cell: Vector2i) -> void:
 	var ok: bool = _cell_is_placeable(cell)
 	_paint_layer.modulate = Color(0.4, 1.0, 0.4, 0.7) if ok else Color(1.0, 0.4, 0.4, 0.7)
 
+	# Phase 13 — no-roof tool: toggle the tile in World.no_roof_cells and
+	# trigger an immediate room recompute.  No build job is queued.
+	if _tool == TOOL_NO_ROOF:
+		World.toggle_no_roof_at(cell)
+		Audit.log("designation", "no_roof toggled at %s" % cell)
+		return
+
 	designation_added.emit(cell, _tool)
 	EventBus.designation_added.emit(cell, _tool)
 	Audit.log("designation", "painted %s at %s (placeable=%s)" % [_tool, cell, ok])