render: extract M2 Mesh resource finalizer

docs/modules/m2-mesh-resource-extractor.md

@@ -92,27 +92,27 @@ No state or Resource reference is retained between calls.
 
 ```mermaid
 sequenceDiagram
-    participant Loader as StreamingWorldLoader
+    participant Finalizer as M2MeshResourceFinalizer
     participant Extractor as M2MeshResourceExtractor
     participant Scene as PackedScene
-    Loader->>Extractor: extract_first_mesh(loaded Resource)
+    Finalizer->>Extractor: extract_first_mesh(loaded Resource)
     alt direct Mesh
-        Extractor-->>Loader: same Mesh reference
+        Extractor-->>Finalizer: same Mesh reference
     else PackedScene
         Extractor->>Scene: instantiate()
         Scene-->>Extractor: temporary root
         Extractor->>Extractor: depth-first first-Mesh search
         Extractor->>Extractor: temporary_root.free()
-        Extractor-->>Loader: Mesh or null
+        Extractor-->>Finalizer: Mesh or null
     end
-    Loader->>Loader: prepare and cache Mesh or mark missing
+    Finalizer->>Finalizer: prepare and cache Mesh or mark missing
 ```
 
 ## Dependency diagram
 
 ```mermaid
 flowchart TB
-    Loader[StreamingWorldLoader] --> Extractor[M2MeshResourceExtractor]
+    Finalizer[M2MeshResourceFinalizer] --> Extractor[M2MeshResourceExtractor]
     Extractor --> Types[Resource / PackedScene / Node / Mesh]
     Loader --> Pipeline[M2MeshLoadPipelineState]
     Loader --> Cache[M2MeshResourceCacheState]
@@ -168,8 +168,8 @@ normalized M2 path. Its verifier measures traversal time and temporary Node coun
 
 ## Extension points
 
-- `M2RuntimeMeshFinalizer` consumes the Mesh returned here and the loader stores
-  its result in `M2MeshResourceCacheState`.
+- `M2MeshResourceFinalizer` passes the Mesh to `M2RuntimeMeshFinalizer` and
+  stores its result in `M2MeshResourceCacheState`.
 - Broader generic scene traversal is intentionally excluded until another real
   consumer requires the same exact contract.
 
@@ -194,8 +194,9 @@ normalized M2 path. Its verifier measures traversal time and temporary Node coun
 | Path | Responsibility |
 |---|---|
 | `src/render/m2/m2_mesh_resource_extractor.gd` | First-Mesh traversal and temporary PackedScene lifetime |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Terminal Resource consumer and extraction caller |
 | `src/render/m2/m2_prototype_cache_state.gd` | Prototype and missing/static-only lookup state |
-| `src/scenes/streaming/streaming_world_loader.gd` | ResourceLoader/raw I/O, cache decisions and materialization |
+| `src/scenes/streaming/streaming_world_loader.gd` | Request admission, permits and materialization |
 | `src/render/m2/m2_runtime_mesh_finalizer.gd` | Refresh/rebuild/fallback preparation |
 | `src/render/m2/m2_mesh_resource_cache_state.gd` | Prepared Mesh retention |
 | `src/tools/verify_m2_mesh_resource_extractor.gd` | Resource/order/lifetime/boundary/timing regression |