render: extract cached M2 animation resource observer

src/tools/verify_m2_animation_load_pipeline_state.gd

@@ -5,6 +5,9 @@ extends SceneTree
 
 const PIPELINE_SCRIPT := preload("res://src/render/m2/m2_animation_load_pipeline_state.gd")
 const PIPELINE_PATH := "res://src/render/m2/m2_animation_load_pipeline_state.gd"
+const OBSERVER_PATH := (
+	"res://src/render/m2/m2_cached_animation_resource_observer.gd"
+)
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
 
 
@@ -80,14 +83,19 @@ func _verify_discard_metrics_clear_and_diagnostics(failures: Array[String]) -> v
 
 func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var pipeline_source := FileAccess.get_file_as_string(PIPELINE_PATH)
+	var observer_source := FileAccess.get_file_as_string(OBSERVER_PATH)
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
 	_expect_true(loader_source.contains("M2_ANIMATION_LOAD_PIPELINE_STATE_SCRIPT.new()"), "loader composes pipeline state", failures)
 	_expect_false(loader_source.contains("var _m2_animation_load_requests:"), "legacy request field removed", failures)
 	_expect_false(loader_source.contains("var _m2_animation_finalize_queue:"), "legacy finalize field removed", failures)
 	_expect_equal(loader_source.count("_m2_animation_load_pipeline_state.total_work_count()"), 3, "three existing metrics delegate", failures)
 	_expect_equal(loader_source.count("_m2_animation_load_pipeline_state.clear()"), 2, "two existing clear sites delegate", failures)
+	_expect_true(
+		observer_source.contains("ResourceLoader.load_threaded_request("),
+		"cached observer owns request admission",
+		failures
+	)
 	for retained_loader_rule in [
-		"ResourceLoader.load_threaded_request(",
 		"ResourceLoader.load_threaded_get_status(path)",
 		"ResourceLoader.load_threaded_get(path)",
 		"RENDER_BUDGET_SCHEDULER_SCRIPT.M2_ANIMATION_FINALIZE",