render: extract WMO scene resource finalizer

src/tools/verify_wmo_scene_resource_cache_state.gd

@@ -6,6 +6,7 @@ const CACHE_STATE_SCRIPT := preload(
 	"res://src/render/wmo/wmo_scene_resource_cache_state.gd"
 )
 const CACHE_STATE_PATH := "res://src/render/wmo/wmo_scene_resource_cache_state.gd"
+const FINALIZER_PATH := "res://src/render/wmo/wmo_scene_resource_finalizer.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
 
 
@@ -233,6 +234,7 @@ func _verify_detached_sorted_diagnostics(failures: Array[String]) -> void:
 func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var loader_source := _read_text(LOADER_PATH, failures)
 	var cache_state_source := _read_text(CACHE_STATE_PATH, failures)
+	var finalizer_source := _read_text(FINALIZER_PATH, failures)
 	_expect_true(
 		loader_source.contains("WMO_SCENE_RESOURCE_CACHE_STATE_SCRIPT.new()"),
 		"loader composes scene cache state",
@@ -266,15 +268,22 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	for retained_loader_rule in [
 		"wmo_max_runtime_scene_mb",
 		"_get_resource_file_size(cache_path)",
-		"_is_wmo_scene_cache_current(resource as PackedScene)",
-		"scene.instantiate() as Node3D",
-		"WMO_BUILDER_SCRIPT.is_scene_cache_current(node)",
 	]:
 		_expect_true(
 			loader_source.contains(retained_loader_rule),
 			"loader retains %s" % retained_loader_rule,
 			failures
 		)
+	for finalizer_rule in [
+		"scene.instantiate()",
+		"is_scene_cache_current",
+		"instance.free()",
+	]:
+		_expect_true(
+			finalizer_source.contains(finalizer_rule),
+			"finalizer owns %s" % finalizer_rule,
+			failures
+		)
 
 
 func _verify_bounded_timing(failures: Array[String]) -> float: