Gate library prop collision coverage across venues

src/game/world_builder.gd

@@ -41,6 +41,11 @@ const LIBRARY_PROPS := ["bollard", "bench", "trash_bin", "planter_box",
 	"newspaper_box", "fire_hydrant", "street_lamp", "street_tree", "traffic_cone",
 	"palm_tree", "round_planter", "a_frame_sign", "crowd_barrier", "stanchion",
 	"security_podium"]
+## Library pieces that are mounted above head height, part of the building shell or
+## purely decorative, so they intentionally publish no walk-blocking body. Anything
+## else in `library_nodes` must carry a `StaticBody3D` + `NavigationObstacle3D`
+## (guarded by `test_library_dressing_collision_matches_the_documented_exemptions`).
+const NON_BLOCKING_LIBRARY := ["marquee", "wall_lantern", "handrail", "double_door"]
 
 var root: Node3D = null
 ## Door lock indicator mesh near the handle; toggled by GameManager.
@@ -336,6 +341,7 @@ func _build_building() -> void:
 		door_model.position = Vector3(0, 0.0, front + 0.16)
 		building.add_child(door_model)
 		library_nodes.append(door_model)
+		door_model.set_meta("library_prop", "double_door")
 		_apply_library_ao(door_model, "double_door")
 		for material in _emissive_materials(door_model):
 			if not _lamp_bulb_mats.has(material):
@@ -1674,6 +1680,7 @@ func _build_marquee() -> void:
 		library.position = Vector3(0, 5.62, -3.9)
 		root.add_child(library)
 		library_nodes.append(library)
+		library.set_meta("library_prop", "marquee")
 		_apply_library_ao(library, "marquee")
 		for material in _emissive_materials(library):
 			if not _marquee_emissive.has(material):
@@ -1714,6 +1721,7 @@ func _build_library_dressing() -> void:
 			rail.rotation_degrees.y = 90.0
 			root.add_child(rail)
 			library_nodes.append(rail)
+			rail.set_meta("library_prop", "handrail")
 			_apply_library_ao(rail, "handrail")
 	if _feature("sedan") and ResourceLoader.exists(BLENDER_PROP_DIR + "sedan.glb"):
 		var sedan_pos: Vector3 = spec.get("sedan_position", Vector3(6.0, 0.1, 17.0))
@@ -1724,6 +1732,7 @@ func _build_library_dressing() -> void:
 			_apply_car_paint(sedan)
 		if not library_nodes.has(sedan):
 			library_nodes.append(sedan)
+		sedan.set_meta("library_prop", "sedan")
 		for material in _emissive_materials(sedan):
 			if not _lamp_bulb_mats.has(material):
 				_lamp_bulb_mats.append(material)
@@ -1795,6 +1804,7 @@ func _add_wall_lantern(pos: Vector3, with_light: bool) -> void:
 	lantern.position = pos
 	root.add_child(lantern)
 	library_nodes.append(lantern)
+	lantern.set_meta("library_prop", "wall_lantern")
 	_apply_library_ao(lantern, "wall_lantern")
 	for material in _emissive_materials(lantern):
 		if not _lamp_bulb_mats.has(material):
@@ -2095,6 +2105,7 @@ func _add_prop_model(parent: Node3D, prop: String, pos: Vector3,
 		if ResourceLoader.exists(BLENDER_PROP_DIR + prop + ".glb"):
 			library_props.append(prop)
 			library_nodes.append(holder)
+			holder.set_meta("library_prop", prop)
 			_apply_library_ao(model, prop)
 	else:
 		var fallback := _fallback_prop(prop)