feat(items): add RoomChest with spawn and receive logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

test/unit/test_room_chest.gd

@@ -35,3 +35,51 @@ func test_room_chest_config_patient_cabinet_stethoscope_outfit_layer_two() -> vo
 	assert_eq(stethoscope.item_id, "stethoscope")
 	assert_eq(stethoscope.item_type, ChestItemData.ItemType.OUTFIT)
 	assert_eq(stethoscope.outfit_layer, 2)
+
+
+func test_are_items_spawned_false_initially() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	assert_false(chest.are_items_spawned())
+
+
+func test_get_spawned_count_zero_initially() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	assert_eq(chest.get_spawned_count(), 0)
+
+
+func test_get_item_config_count_matches_config() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	assert_eq(chest.get_item_config_count(), 3)
+
+
+func test_spawn_items_creates_correct_count() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	chest.spawn_items()
+	assert_eq(chest.get_spawned_count(), 3)
+
+
+func test_double_spawn_is_noop() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	chest.spawn_items()
+	chest.spawn_items()
+	assert_eq(chest.get_spawned_count(), 3)
+
+
+func test_receive_item_decrements_spawned_count() -> void:
+	var chest: RoomChest = RoomChest.new()
+	chest.chest_id = "reception_desk"
+	add_child_autofree(chest)
+	chest.spawn_items()
+	var item: HoldableItem = chest._spawned_items[0] as HoldableItem
+	chest.receive_item(item)
+	assert_eq(chest.get_spawned_count(), 2)