render: extract M2 Mesh resource finalizer

docs/modules/m2-runtime-mesh-finalizer.md

@@ -27,9 +27,8 @@ UV-rotation cases and returning the historical original-Mesh fallback.
 
 ```mermaid
 flowchart LR
-    Extractor[M2MeshResourceExtractor] --> Loader[StreamingWorldLoader]
-    Loader -->|is raw data required?| Finalizer[M2RuntimeMeshFinalizer]
-    Loader --> Raw[M2RawModelRepository]
+    ResourceFinalizer[M2MeshResourceFinalizer] -->|is raw data required?| Finalizer[M2RuntimeMeshFinalizer]
+    ResourceFinalizer --> Raw[M2RawModelRepository]
     Raw --> Finalizer
     Finalizer --> Classifier[M2RuntimeMeshRebuildClassifier]
     Finalizer --> Builder[M2Builder]
@@ -54,8 +53,8 @@ Nodes outside temporary rebuild roots and other application layers are forbidden
 
 | Direction | Contract/data | Producer | Consumer | Ownership | Thread/lifetime |
 |---|---|---|---|---|---|
-| Input | Extracted Mesh and normalized M2 path | Loader/extractor adapter | Finalizer | Borrowed Mesh reference/String copy | One call |
-| Input | Already-loaded raw M2 Dictionary | `M2RawModelRepository` through loader adapter | Classifier/M2Builder | Caller-owned value container | One call |
+| Input | Extracted Mesh and normalized M2 path | Mesh resource finalizer | Finalizer | Borrowed Mesh reference/String copy | One call |
+| Input | Already-loaded raw M2 Dictionary | `M2RawModelRepository` through resource finalizer | Classifier/M2Builder | Caller-owned value container | One call |
 | Input | Extracted directory path | Loader configuration | M2Builder texture resolution | Copied String | One rebuild |
 | Output | Original or rebuilt current Mesh | Finalizer | Cache/prototype adapter | Borrowed/new Resource reference | Cache may retain |
 
@@ -101,24 +100,24 @@ map/reset clear site calls `clear()`.
 
 ```mermaid
 sequenceDiagram
-    participant Loader as StreamingWorldLoader
+    participant ResourceFinalizer as M2MeshResourceFinalizer
     participant Finalizer as M2RuntimeMeshFinalizer
     participant Raw as M2Loader boundary
     participant Classifier as RebuildClassifier
     participant Builder as M2Builder
-    Loader->>Finalizer: requires_raw_data_for_refresh(mesh)
+    ResourceFinalizer->>Finalizer: requires_raw_data_for_refresh(mesh)
     alt current Mesh
-        Finalizer-->>Loader: false; reuse Mesh
+        Finalizer-->>ResourceFinalizer: false; reuse Mesh
     else stale Mesh
-        Finalizer-->>Loader: true
-        Loader->>Raw: load static raw Dictionary
-        Loader->>Finalizer: finalize_mesh(path, mesh, raw, extracted dir)
+        Finalizer-->>ResourceFinalizer: true
+        ResourceFinalizer->>Raw: load static raw Dictionary
+        ResourceFinalizer->>Finalizer: finalize_mesh(path, mesh, raw, extracted dir)
         Finalizer->>Classifier: needs_runtime_mesh_rebuild(path, raw)
         opt rebuild required
             Finalizer->>Builder: build(raw, extracted dir)
             Finalizer->>Finalizer: extract first Mesh; free prototype
         end
-        Finalizer-->>Loader: rebuilt or marked fallback Mesh
+        Finalizer-->>ResourceFinalizer: rebuilt or marked fallback Mesh
     end
 ```
 
@@ -126,12 +125,12 @@ sequenceDiagram
 
 ```mermaid
 flowchart TB
-    Loader[StreamingWorldLoader] --> Finalizer[M2RuntimeMeshFinalizer]
+    ResourceFinalizer[M2MeshResourceFinalizer] --> Finalizer[M2RuntimeMeshFinalizer]
     Finalizer --> Classifier[M2RuntimeMeshRebuildClassifier]
     Finalizer --> Extractor[M2MeshResourceExtractor]
     Finalizer --> Builder[M2Builder]
-    Loader --> Raw[M2RawModelRepository]
-    Loader --> Cache[M2MeshResourceCacheState]
+    ResourceFinalizer --> Raw[M2RawModelRepository]
+    ResourceFinalizer --> Cache[M2MeshResourceCacheState]
     Finalizer -. no dependency .-> Raw
     Finalizer -. no dependency .-> Cache
 ```
@@ -139,7 +138,8 @@ flowchart TB
 ## Ownership, threading and resources
 
 - Renderer main thread executes metadata changes and M2Builder work.
-- `M2RawModelRepository` owns raw M2 file/native calls; loader supplies its value result.
+- `M2RawModelRepository` owns raw M2 file/native calls; the Mesh resource
+  finalizer supplies its value result.
 - Finalizer owns classifier memoization and temporary rebuild prototype lifetime.
 - M2Builder owns construction rules; extractor selects the first rebuilt Mesh.
 - Cache/prototype adapters decide where the returned Mesh reference is retained.
@@ -208,7 +208,8 @@ logs/queue metrics are unchanged. Normalized M2 path remains the correlation key
 |---|---|
 | `src/render/m2/m2_runtime_mesh_finalizer.gd` | Refresh version, classification, rebuild and fallback |
 | `src/render/m2/m2_raw_model_repository.gd` | Raw-file/native I/O and Dictionary result |
-| `src/scenes/streaming/streaming_world_loader.gd` | Repository call and returned-Mesh adoption |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Repository call and returned-Mesh adoption |
+| `src/scenes/streaming/streaming_world_loader.gd` | Service composition, permits and materialization |
 | `src/render/m2/m2_runtime_mesh_rebuild_classifier.gd` | Memoized billboard/UV-rotation predicate |
 | `src/render/m2/m2_mesh_resource_extractor.gd` | First rebuilt-Mesh selection |
 | `src/tools/verify_m2_runtime_mesh_finalizer.gd` | Transition/rebuild/boundary/timing regression |