refactor(M03): extract M2 animated scene finalizer

RENDER.md

@@ -36,6 +36,7 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 - `src/render/liquid/adt_water_load_pipeline_state.gd` - ADT water pending FIFO/dedupe, active task IDs and worker-safe parsed-result mailbox without parser or Node ownership.
 - `src/render/liquid/adt_water_scene_finalizer.gd` - stateless main-thread ADT water build/attach and optional persisted Editor ownership through the existing ADTBuilder.
 - `src/render/m2/m2_runtime_mesh_rebuild_classifier.gd` - memoized billboard/UV-rotation decision for stale cached M2 runtime mesh refresh.
+- `src/render/m2/m2_animated_scene_finalizer.gd` - animated PackedScene candidate ownership, historical material repair and AnimationPlayer validation.
 - `src/render/m2/m2_animation_load_pipeline_state.gd` - animated M2 threaded-load request records and completion-order finalize FIFO without I/O or Node ownership.
 - `src/render/m2/m2_mesh_load_pipeline_state.gd` - static M2 threaded-load request records, terminal statuses and completion-order finalize FIFO without I/O or Mesh ownership.
 - `src/render/m2/m2_mesh_resource_cache_state.gd` - normalized-path prepared static M2 Mesh references with final-shutdown lifetime.
@@ -1098,6 +1099,22 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - Cache formats, animation behavior and visible output are unchanged. Synthetic
   timing is not asset-backed I/O, leak, animation-fidelity or p95/p99 evidence.
 
+## 2026-07-18 M2 Animated Scene Finalizer Extraction
+
+- `M2AnimatedSceneFinalizer` now owns terminal animated PackedScene candidate
+  instantiation, depth-first Mesh/AnimationPlayer traversal, static-prototype
+  material override mapping and rejected detached-root destruction.
+- Material repair retains source/target depth-first ordering, source-index clamp,
+  per-surface override priority and first discovered material fallback.
+- A candidate still requires at least one AnimationPlayer. Accepted exact Node3D
+  and player count return to the loader; invalid candidates are freed, including
+  the previously unhandled non-Node3D imported-root case.
+- `StreamingWorldLoader` retains ResourceLoader I/O/statuses, finalize permits,
+  material-prototype selection/loading, prototype adoption/static fallback,
+  animation playback policy and diagnostic logging.
+- Cache formats, profiles and visible rules are unchanged. Synthetic scene and
+  material fixtures are not asset-backed animation-fidelity or p95/p99 evidence.
+
 ## 2026-07-17 M2 Mesh Resource Cache State Extraction
 
 - `M2MeshResourceCacheState` now owns normalized-path references to prepared