render: extract animated M2 materializer

src/tools/verify_m2_animated_scene_finalizer.gd

@@ -5,6 +5,7 @@ extends SceneTree
 
 const FINALIZER_SCRIPT := preload("res://src/render/m2/m2_animated_scene_finalizer.gd")
 const FINALIZER_PATH := "res://src/render/m2/m2_animated_scene_finalizer.gd"
+const MATERIALIZER_PATH := "res://src/render/m2/m2_animated_instance_materializer.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
 
 
@@ -115,6 +116,7 @@ func _verify_material_mapping(failures: Array[String]) -> void:
 
 func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var finalizer_source := FileAccess.get_file_as_string(FINALIZER_PATH)
+	var materializer_source := FileAccess.get_file_as_string(MATERIALIZER_PATH)
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
 	_expect_true(loader_source.contains("M2_ANIMATED_SCENE_FINALIZER_SCRIPT.new()"), "loader composes finalizer", failures)
 	for removed_loader_function in [
@@ -128,9 +130,14 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		"_m2_animated_scene_finalizer.repair_materials(candidate, material_source)",
 		"_m2_animated_scene_finalizer.finalize_candidate(candidate)",
 		"_m2_animated_scene_finalizer.mesh_instances_in_subtree(root)",
-		"_m2_animated_scene_finalizer.animation_players_in_subtree(",
 	]:
 		_expect_equal(loader_source.count(delegated_call), 1, "single loader delegation: %s" % delegated_call, failures)
+	_expect_equal(
+		materializer_source.count("_animated_scene_finalizer.animation_players_in_subtree("),
+		1,
+		"single materializer player-inventory delegation",
+		failures
+	)
 	for retained_loader_rule in [
 		"ResourceLoader.load_threaded_get(path)",
 		"RENDER_BUDGET_SCHEDULER_SCRIPT.M2_ANIMATION_FINALIZE",