merge: M2 Mesh resource finalizer

2026-07-18 13:51:25 +04:00
parent c328d86554 71a1012779
commit 34b700051f
22 changed files with 1162 additions and 157 deletions
@@ -47,6 +47,7 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 - `src/render/m2/m2_cached_animation_resource_observer.gd` - cached animated GLB eligibility, threaded request admission and snapshot production.
 - `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_animation_resource_finalizer.gd` - cached animated M2 terminal status polling, Resource load, scene finalization and prototype/static-only outcome.
+- `src/render/m2/m2_mesh_resource_finalizer.gd` - static M2 terminal status polling, Mesh extraction/preparation and cache/missing outcome.
 - `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.
 - `src/render/m2/m2_mesh_resource_extractor.gd` - first-Mesh selection from direct/PackedScene/Node inputs with temporary instance cleanup.
@@ -1169,6 +1170,22 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - No request order, status rule, cache format, profile or visible behavior changed.
  Synthetic fixtures are not asset-backed animation/leak/p95/p99 evidence.

+## 2026-07-18 M2 Mesh Resource Finalizer Extraction
+
+- `M2MeshResourceFinalizer` now owns static M2 terminal status polling,
+  completion-FIFO pops, terminal Resource retrieval, first-Mesh extraction,
+  stale/current runtime preparation and Mesh/missing cache adoption.
+- Pending paths are still polled in insertion order. One
+  `M2_MESH_FINALIZE` permit still pops at most one terminal record; cached Mesh
+  outcomes skip terminal retrieval exactly as before.
+- Current Meshes retain exact identity and skip raw reads. Stale Meshes still
+  request raw data only when `M2RuntimeMeshFinalizer` requires it, preserving
+  refresh-version, rebuild and original-Mesh fallback rules.
+- `StreamingWorldLoader` retains request admission, scheduler permits,
+  composition, static materialization and shutdown drain ordering. Cache paths,
+  profiles and visible behavior are unchanged; synthetic fixtures are not
+  asset-backed visual/leak/p95/p99 evidence.
+
 ## 2026-07-18 M2 Native Animation Resource Observer Extraction

 - `M2NativeAnimationResourceObserver` now owns the exact case-insensitive
@@ -1244,12 +1261,14 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'

 - `M2RuntimeMeshFinalizer` now owns material refresh version `2`, stale-Mesh
  rebuild classification, M2Builder rebuild and original-Mesh fallback.
- Current Meshes still skip raw `.m2` loading. `M2RawModelRepository` now owns
-  FileAccess/ClassDB M2Loader I/O and supplies raw data through the loader only
-  when the finalizer reports a stale Mesh; both historical clear sites persist.
+- Current Meshes still skip raw `.m2` loading. `M2RawModelRepository` owns
+  FileAccess/ClassDB M2Loader I/O and supplies raw data through
+  `M2MeshResourceFinalizer` only when the runtime finalizer reports a stale Mesh;
+  both historical clear sites persist.
 - Billboard/UV-rotation predicates, rebuild extraction, metadata key and failure
-  fallback are unchanged. Cache adoption decisions, permits and MultiMesh
-  materialization remain loader-owned; negative outcomes belong to prototype state.
+  fallback are unchanged. Mesh resource finalization owns cache adoption;
+  permits and MultiMesh materialization remain loader-owned, while negative
+  outcomes belong to prototype state.
 - Synthetic triangle rebuild/fallback timing is not asset-backed material,
  descriptor-pressure/leak or p95/p99 evidence.

@@ -58,14 +58,22 @@ loader into one dedicated finalization service.

 ## Status

- State: active
- Done: ownership/compatibility contract
- Next: implementation, verification and documentation
+- State: ready
+- Done: implementation, verification and documentation
+- Next: merge and post-merge acceptance
 - Blocked by:

 ## Handoff

- Commit:
- Results:
- Remaining risks:
- Documentation updated:
+- Commit: `ddeb708` (`render: extract M2 Mesh resource finalizer`)
+- Results: finalizer PASS `cases=31 iterations=1000 elapsed_ms=0.767`;
+  adjacent Mesh pipeline/cache/extractor/runtime-finalizer/raw-repository/
+  prototype/shutdown checks passed; autonomous headless suite `59/59`;
+  documentation `46`; coordination passed with `34` historical warnings;
+  checkpoint dry-run `7/7`.
+- Remaining risks: terminal instantiation/raw parsing/rebuild remain synchronous
+  main-thread work behind existing permits; no private-asset visual, leak,
+  descriptor-pressure or p95/p99 evidence was added.
+- Documentation updated: new full module specification with API/I/O and
+  data-flow/state/sequence/dependency diagrams; adjacent M2 module specs,
+  world-renderer registry/spec, `RENDER.md` and M03 Evidence.
@@ -37,6 +37,7 @@
 | M2 mesh load pipeline state | Implemented extraction | [`m2-mesh-load-pipeline-state.md`](m2-mesh-load-pipeline-state.md) |
 | M2 mesh resource cache state | Implemented extraction | [`m2-mesh-resource-cache-state.md`](m2-mesh-resource-cache-state.md) |
 | M2 mesh resource extractor | Implemented extraction | [`m2-mesh-resource-extractor.md`](m2-mesh-resource-extractor.md) |
+| M2 mesh resource finalizer | Implemented extraction | [`m2-mesh-resource-finalizer.md`](m2-mesh-resource-finalizer.md) |
 | M2 runtime mesh finalizer | Implemented extraction | [`m2-runtime-mesh-finalizer.md`](m2-runtime-mesh-finalizer.md) |
 | M2 raw model repository | Implemented extraction | [`m2-raw-model-repository.md`](m2-raw-model-repository.md) |
 | M2 prototype cache state | Implemented extraction | [`m2-prototype-cache-state.md`](m2-prototype-cache-state.md) |
@@ -78,7 +78,7 @@ Side effects are limited to collection mutation and retaining String/integer val
 flowchart TD
    Start[Successful ResourceLoader request] --> Remember[remember request]
    Remember --> Snapshot[request records snapshot]
-    Snapshot --> Poll[Loader polls status]
+    Snapshot --> Poll[Mesh resource finalizer polls status]
    Poll --> Active{In progress?}
    Active -->|yes| Snapshot
    Active -->|no| Complete[complete request with terminal status]
@@ -86,7 +86,7 @@ flowchart TD
    FIFO --> Permit{Loader permit available?}
    Permit -->|no| FIFO
    Permit -->|yes| Pop[Pop oldest terminal record]
-    Pop --> Finalize[Loader gets Resource and delegates first-Mesh extraction]
+    Pop --> Finalize[Mesh resource finalizer gets Resource and extracts first Mesh]
    Finalize --> Prepare[M2RuntimeMeshFinalizer prepares Mesh]
    Prepare --> Adopt[Loader adopts Mesh or marks prototype outcome state]
 ```
@@ -113,6 +113,7 @@ again only if loader cache/missing rules permit it.
 ```mermaid
 sequenceDiagram
    participant Loader as StreamingWorldLoader
+    participant Finalizer as M2MeshResourceFinalizer
    participant Resource as ResourceLoader
    participant State as M2MeshLoadPipelineState
    participant Budget as RenderBudgetScheduler
@@ -120,14 +121,16 @@ sequenceDiagram
    Resource-->>Loader: OK or ERR_BUSY
    Loader->>State: remember_request(normalized, cache path)
    loop frames
-        Loader->>State: request_records_snapshot()
-        Loader->>Resource: load_threaded_get_status(path)
+        Loader->>Finalizer: poll_terminal_requests(state, prototype cache)
+        Finalizer->>State: request_records_snapshot()
+        Finalizer->>Resource: load_threaded_get_status(path)
    end
-    Loader->>State: complete_request(normalized, terminal status)
+    Finalizer->>State: complete_request(normalized, terminal status)
    Loader->>Budget: try_consume_permit(M2_MESH_FINALIZE)
-    Loader->>State: pop_finalize_record()
-    Loader->>Resource: load_threaded_get(path)
-    Loader->>Loader: extract/refresh/adopt Mesh or mark missing
+    Loader->>Finalizer: finalize_next_resource(state, caches, directory)
+    Finalizer->>State: pop_finalize_record()
+    Finalizer->>Resource: load_threaded_get(path)
+    Finalizer->>Finalizer: extract/refresh/adopt Mesh or mark missing
 ```

 ## Dependency diagram
@@ -135,7 +138,9 @@ sequenceDiagram
 ```mermaid
 flowchart TB
    Loader[StreamingWorldLoader] --> State[M2MeshLoadPipelineState]
-    Loader --> Resource[ResourceLoader]
+    Loader --> MeshFinalizer[M2MeshResourceFinalizer]
+    MeshFinalizer --> State
+    MeshFinalizer --> Resource[ResourceLoader]
    Loader --> Budget[RenderBudgetScheduler]
    Loader --> MeshCache[M2 Mesh resource and prototype outcome cache states]
    Loader --> Finalizer[M2RuntimeMeshFinalizer]
@@ -148,7 +153,9 @@ flowchart TB

 - Main thread serializes all state mutation and snapshots.
 - State owns only request/finalize Dictionaries containing Strings and status integers.
- Loader owns ResourceLoader request lifetime and drains active paths before shutdown clear.
+- `M2MeshResourceFinalizer` owns terminal status polling, terminal Resource
+  retrieval, first-Mesh extraction, runtime preparation and cache/missing adoption.
+- Loader owns request admission, scheduler permits and shutdown drain ordering.
 - `M2MeshResourceCacheState` owns prepared static Mesh references and
  `M2RuntimeMeshFinalizer` owns refresh/rebuild/fallback. The loader owns shared
  adoption decisions, raw I/O and remaining engine resources; the prototype
@@ -161,9 +168,9 @@ flowchart TB
 |---|---|---|---|---|
 | Empty/duplicate request | State guard | Reject unchanged | Contract verifier | Correct caller/request later |
 | Request start failure | Loader return code | No state insert; mark missing | Existing loader behavior | Cache/source correction |
-| Non-terminal status | Loader poll | Keep pending | Existing queue metric | Poll next frame |
-| Terminal load failure | Status in popped record | Loader marks missing | Existing missing behavior | World/cache reload |
-| Empty defensive path | Loader before poll | Discard and mark missing | Source regression | Correct request producer |
+| Non-terminal status | Finalizer poll | Keep pending | Existing queue metric | Poll next frame |
+| Terminal load failure | Status in popped record | Finalizer marks missing | Existing missing behavior | World/cache reload |
+| Empty defensive path | Finalizer before poll | Discard and mark missing | Source regression | Correct request producer |
 | Shutdown | Loader drains pending Resource paths | Clear state | Shutdown verifier | New loader starts empty |

 ## Configuration and capabilities
@@ -207,7 +214,7 @@ rebuild policy are unchanged; no migration or rebake is required.
 |---|---|---|---|
 | Static M2 request/finalize state | Implemented extraction | Contract/source/timing verifier | Asset-backed long traversal pending |
 | Static request admission I/O | Implemented in observer | Observer/shutdown regressions | Asset-backed traversal pending |
-| Static request polling/finalize I/O | Existing loader-owned | Shutdown/material regressions | Finalize extraction optional |
+| Static request polling/finalize I/O | Implemented extraction | Finalizer contract/source/timing verifier | Asset-backed traversal pending |
 | Mesh cache | Implemented extraction | Mesh resource cache state verifier | Asset-backed memory/leak run pending |
 | First-Mesh extraction | Implemented extraction | Resource/order/lifetime verifier | Asset-backed corrupt-scene fixture pending |
 | Mesh preparation | Implemented extraction | Runtime finalizer transition/rebuild verifier | Asset-backed material comparison pending |
@@ -225,11 +232,12 @@ rebuild policy are unchanged; no migration or rebake is required.
 | Path | Responsibility |
 |---|---|
 | `src/render/m2/m2_mesh_load_pipeline_state.gd` | Pending records, terminal FIFO and metrics |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Terminal polling, Resource extraction, preparation and adoption |
 | `src/render/m2/m2_mesh_resource_cache_state.gd` | Prepared static Mesh references and final clear |
 | `src/render/m2/m2_mesh_resource_extractor.gd` | First-Mesh selection and temporary PackedScene lifetime |
 | `src/render/m2/m2_runtime_mesh_finalizer.gd` | Refresh/rebuild/fallback preparation |
 | `src/render/m2/m2_prototype_cache_state.gd` | Missing-model outcome retention |
-| `src/scenes/streaming/streaming_world_loader.gd` | Cache path choice, I/O polling, permits and adoption decisions |
+| `src/scenes/streaming/streaming_world_loader.gd` | Cache path choice, request admission, permits and composition |
 | `src/render/m2/m2_runtime_mesh_rebuild_classifier.gd` | Downstream stale Mesh rebuild decision |
 | `src/tools/verify_m2_mesh_load_pipeline_state.gd` | Lifecycle/boundary/timing regression |

@@ -103,9 +103,9 @@ sequenceDiagram
    participant Pipeline as M2MeshLoadPipelineState
    Loader->>Cache: find/has normalized path
    alt cache miss
-        Loader->>Pipeline: request/poll/finalize record
-        Loader->>Loader: ResourceLoader get; delegate extract + prepare
-        Loader->>Cache: store_mesh(path, prepared Mesh)
+        Loader->>Pipeline: request record
+        Loader->>Finalizer: poll/finalize one permitted record
+        Finalizer->>Cache: store_mesh(path, prepared Mesh)
    end
    Cache-->>Loader: exact retained Mesh
    Loader->>Loader: materialize static M2 batch
@@ -133,8 +133,9 @@ flowchart TB
 - Borrowed Mesh lookups do not transfer ownership or duplicate resources.
 - `M2MeshResourceExtractor` owns first-Mesh selection and temporary PackedScene
  instances. `M2PrototypeCacheState` owns missing/prototype/animated state; the
-  static materializer owns MultiMesh construction/attachment; the loader owns
-  resource adoption and build-job decisions.
+  static materializer owns MultiMesh construction/attachment;
+  `M2MeshResourceFinalizer` owns resource adoption, while the loader owns
+  build-job and scheduler-permit decisions.
 - The loader drains asynchronous work before the final cache clear.

 ## Errors, cancellation and recovery
@@ -186,7 +187,7 @@ the historical Mesh cache had no queue contribution or log site.
 | Capability | Status | Evidence | Gap/next step |
 |---|---|---|---|
 | Prepared static M2 Mesh cache | Implemented extraction | Contract/source/timing verifier | Asset-backed memory/leak run pending |
-| M2 Mesh request lifecycle | Implemented extraction | Pipeline state verifier | Finalize polling remains loader-owned |
+| M2 Mesh request lifecycle | Implemented extraction | Pipeline/finalizer verifiers | Asset-backed traversal pending |
 | M2 Mesh extraction | Implemented extraction | Resource/order/lifetime verifier | Asset-backed corrupt-scene fixture pending |
 | M2 Mesh preparation | Implemented extraction | Runtime finalizer transition/rebuild verifier | Asset-backed material comparison pending |

@@ -203,8 +204,9 @@ the historical Mesh cache had no queue contribution or log site.
 |---|---|
 | `src/render/m2/m2_mesh_resource_cache_state.gd` | Prepared Mesh references and final clear |
 | `src/render/m2/m2_mesh_resource_extractor.gd` | First-Mesh selection and temporary PackedScene lifetime |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Prepared Mesh producer and cache adoption |
 | `src/render/m2/m2_prototype_cache_state.gd` | Prototype references and negative lookup outcomes |
-| `src/scenes/streaming/streaming_world_loader.gd` | Normalization, raw/resource I/O and materialization |
+| `src/scenes/streaming/streaming_world_loader.gd` | Normalization, request admission, permits and materialization |
 | `src/render/m2/m2_runtime_mesh_finalizer.gd` | Refresh/rebuild/fallback preparation |
 | `src/render/m2/m2_mesh_load_pipeline_state.gd` | Pending request and terminal finalize records |
 | `src/tools/verify_m2_mesh_resource_cache_state.gd` | Cache ownership/lifetime/boundary/timing regression |
@@ -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 |
@@ -0,0 +1,251 @@
+# M2 Mesh Resource Finalizer
+
+## Metadata
+
+| Field | Value |
+|---|---|
+| Status | Implemented extraction |
+| Target/work package | M03 / `M03-RND-M2-MESH-RESOURCE-FINALIZER-001` |
+| Owners | Static M2 terminal Resource I/O, Mesh preparation and cache outcome |
+| Last verified | Worktree `work/sindo-main-codex/m03-m2-mesh-resource-finalizer`, 2026-07-18 |
+| Profiles/capabilities | Existing cached/static MultiMesh M2 path |
+
+## Purpose
+
+Drain static M2 ResourceLoader work and publish a prepared Mesh or missing-model
+outcome without keeping terminal I/O and refresh logic in `StreamingWorldLoader`.
+The same preparation method serves threaded and synchronous Mesh consumers.
+
+## Non-goals
+
+- Select cache candidates or admit threaded ResourceLoader requests.
+- Own scheduler permits, prototype Nodes, MultiMeshes or SceneTree roots.
+- Change first-Mesh traversal, refresh version, rebuild rules or raw parser.
+- Merge static and animated terminal services through callbacks/frameworks.
+- Change cache formats, profiles or visible output.
+
+## Context and boundaries
+
+```mermaid
+flowchart LR
+    Observer[M2StaticBuildResourceObserver] --> Pipeline[M2MeshLoadPipelineState]
+    Loader[StreamingWorldLoader] --> Finalizer[M2MeshResourceFinalizer]
+    Pipeline --> Finalizer
+    ResourceLoader --> Finalizer
+    Finalizer --> Extractor[M2MeshResourceExtractor]
+    Finalizer --> Runtime[M2RuntimeMeshFinalizer]
+    Finalizer --> Raw[M2RawModelRepository]
+    Finalizer --> MeshCache[M2MeshResourceCacheState]
+    Finalizer --> Prototype[M2PrototypeCacheState]
+```
+
+## Public API
+
+| Symbol | Kind | Purpose | Failure behavior |
+|---|---|---|---|
+| `poll_terminal_requests(pipeline, prototype_cache)` | I/O command | Move LOADED/FAILED records into completion FIFO | Invalid composition returns zero |
+| `finalize_next_resource(pipeline, mesh_cache, prototype_cache, extracted_dir)` | I/O command | Pop one record and publish Mesh/missing outcome | Empty/invalid composition returns false |
+| `prepare_mesh_for_runtime(path, mesh, extracted_dir)` | I/O preparation | Preserve current Mesh or load raw data and refresh stale Mesh | Null returns null |
+| `load_threaded_get_status(path)` | I/O adapter | Production status query with injectable test seam | Returns ResourceLoader status |
+| `load_threaded_get(path)` | I/O adapter | Production terminal Resource retrieval with injectable test seam | May return null |
+
+## Inputs and outputs
+
+| Direction | Data | Producer | Consumer | Ownership/lifetime |
+|---|---|---|---|---|
+| Input | Pending/finalize records | Mesh pipeline | Finalizer | Pipeline-owned copied Dictionaries |
+| Input | Terminal Resource | ResourceLoader | Mesh extractor | Borrowed one operation |
+| Input | Extracted/cached Mesh | Mesh extractor/loader consumer | Runtime preparation | Borrowed Resource reference |
+| Input | Raw M2 Dictionary | Raw repository | Runtime finalizer | Call-local value |
+| Output | Prepared Mesh | Runtime finalizer | Mesh cache/loader consumer | Resource reference |
+| Output | Missing-model outcome | Finalizer | Prototype cache | Copied path; loader session |
+| Output | Processed-record flag | Finalizer | Loader permit loop/tests | Boolean value |
+
+## Data flow
+
+```mermaid
+flowchart TD
+    Poll[Poll pending records in insertion order] --> Path{Resource path empty?}
+    Path -->|yes| Discard[Discard and mark missing]
+    Path -->|no| Status{LOADED or FAILED?}
+    Status -->|no| Pending[Keep pending]
+    Status -->|yes| Complete[Append completion FIFO]
+    Complete --> Permit[Loader consumes M2_MESH_FINALIZE permit]
+    Permit --> Pop[Pop oldest terminal record]
+    Pop --> Cached{Empty path or Mesh cached?}
+    Cached -->|yes| Skip[Finish one permit operation]
+    Cached -->|no| Loaded{Status LOADED?}
+    Loaded -->|no| Missing[Mark model missing]
+    Loaded -->|yes| Get[Get terminal Resource]
+    Get --> Extract[Extract first Mesh]
+    Extract --> Found{Mesh found?}
+    Found -->|no| Missing
+    Found -->|yes| Current{Refresh version current?}
+    Current -->|yes| Store[Store exact Mesh]
+    Current -->|no| Raw[Read raw M2 data]
+    Raw --> Refresh[Finalize/rebuild/fallback Mesh]
+    Refresh --> Store
+```
+
+## Lifecycle/state
+
+```mermaid
+stateDiagram-v2
+    [*] --> Polling
+    Polling --> Pending: nonterminal status
+    Polling --> TerminalQueued: LOADED or FAILED
+    Polling --> Missing: empty Resource path
+    TerminalQueued --> Skipped: empty/cached record
+    TerminalQueued --> Missing: failed load or no Mesh
+    TerminalQueued --> Extracted: Mesh found
+    Extracted --> Current: refresh version current
+    Extracted --> Refreshing: stale Mesh
+    Refreshing --> Prepared: rebuild or fallback
+    Current --> Cached
+    Prepared --> Cached
+    Pending --> [*]
+    Skipped --> [*]
+    Missing --> [*]
+    Cached --> [*]
+```
+
+## Main sequence
+
+```mermaid
+sequenceDiagram
+    participant L as StreamingWorldLoader
+    participant F as M2MeshResourceFinalizer
+    participant P as M2MeshLoadPipelineState
+    participant R as ResourceLoader
+    participant E as M2MeshResourceExtractor
+    participant N as M2RuntimeMeshFinalizer
+    participant C as M2MeshResourceCacheState
+    L->>F: poll_terminal_requests(P, prototype cache)
+    F->>R: load_threaded_get_status(path)
+    F->>P: complete terminal request
+    L->>L: consume M2_MESH_FINALIZE permit
+    L->>F: finalize_next_resource(...)
+    F->>P: pop oldest record
+    F->>R: load_threaded_get(path)
+    F->>E: extract_first_mesh(Resource)
+    F->>N: requires_raw_data_for_refresh(Mesh)
+    opt stale Mesh
+        F->>F: read raw M2 data
+        F->>N: finalize_mesh(...)
+    end
+    F->>C: store prepared Mesh
+```
+
+## Dependency diagram
+
+```mermaid
+flowchart TB
+    Finalizer[M2MeshResourceFinalizer] --> ResourceLoader
+    Finalizer --> Pipeline[M2MeshLoadPipelineState]
+    Finalizer --> Extractor[M2MeshResourceExtractor]
+    Finalizer --> Runtime[M2RuntimeMeshFinalizer]
+    Finalizer --> Raw[M2RawModelRepository]
+    Finalizer --> MeshCache[M2MeshResourceCacheState]
+    Finalizer --> Prototype[M2PrototypeCacheState]
+    Loader[StreamingWorldLoader] --> Finalizer
+    Loader --> Scheduler[RenderBudgetScheduler]
+    Finalizer -. no dependency .-> Scheduler
+    Finalizer -. no dependency .-> MultiMesh
+    Finalizer -. no dependency .-> SceneTree
+```
+
+## Ownership, threading and resources
+
+- All operations run synchronously on the renderer main thread.
+- Pipeline owns pending/completion records; one permit pops one terminal record.
+- Extractor owns temporary PackedScene instance cleanup and returns a Mesh reference.
+- Runtime finalizer owns stale/current/rebuild/fallback rules; raw repository owns
+  only call-local native I/O.
+- Mesh cache retains prepared Mesh references until final shutdown; prototype
+  cache retains missing-model paths.
+- Service retains dependency references but no pending record, Resource, Mesh or
+  raw Dictionary between calls. Loader retains permits and materialization.
+
+## Errors, cancellation and recovery
+
+| Failure/state | Behavior | Recovery |
+|---|---|---|
+| Missing composition dependency | Return zero/false; preparation keeps Mesh where possible | Correct composition |
+| Empty Resource path | Discard request and mark missing | Repair cache and restart session |
+| Nonterminal status | Keep pending | Poll next tick |
+| FAILED status | Pop and mark missing | Repair cache and restart session |
+| Existing cached Mesh | Pop and skip terminal Resource get | None |
+| Null/unsupported/no-Mesh Resource | Mark missing | Repair imported cache |
+| Raw read/rebuild unavailable | Runtime finalizer marks/reuses original Mesh | Existing fallback |
+| Tile cancellation | Shared cache work continues | Loader queue remains authoritative |
+| Shutdown | Loader drains ResourceLoader before pipeline/cache clear | New loader starts empty |
+
+## Configuration and capabilities
+
+The service consumes the existing extracted directory. The scheduler retains
+`m2_mesh_finalize_ops_per_tick`; material refresh version remains `2`.
+
+## Persistence, cache and migration
+
+No cache path, schema or version changes are introduced. Existing `.tscn/.glb`
+Resources and in-memory refresh metadata remain compatible; no rebake is required.
+
+## Diagnostics and observability
+
+The service adds no log. Existing pending-plus-finalize metrics and refresh
+metadata remain unchanged. Normalized relative path remains the correlation key.
+
+## Verification
+
+- Dedicated verifier covers status insertion order, empty-path discard, FIFO,
+  failed/cached/null outcomes, terminal get, exact Mesh identity, stale-only raw
+  read, exact finalizer arguments, cache adoption, source ownership and timing.
+- Pipeline/cache/extractor/runtime-finalizer/raw-repository/prototype/shutdown,
+  facade, internal-access and baseline regressions protect adjacent behavior.
+- Fidelity evidence is exact lifecycle/I/O extraction only; no private asset,
+  original-client visual, leak-pressure or p95/p99 claim is made.
+
+## Extension points
+
+Further extraction can move static prototype/material-source construction without
+changing this terminal Resource contract. Animated finalization remains separate
+because its candidate-before-material ordering and Node ownership differ.
+
+## Capability status
+
+| Capability | Status | Evidence | Gap/next step |
+|---|---|---|---|
+| Static terminal polling/load | Implemented extraction | Status/FIFO/load/source verifier | Asset-backed traversal pending |
+| Mesh extraction/preparation/cache outcome | Implemented extraction | Identity/raw/finalizer/store verifier | Private leak/p95/p99 pending |
+| Static MultiMesh materialization | Separate implemented service | Materializer verifier | GPU/asset-backed evidence pending |
+
+## Known gaps and risks
+
+- Terminal Resource get, extraction and stale rebuild remain synchronous main-thread work.
+- Prepared Mesh cache remains unbounded until final shutdown.
+- Private asset traversal, descriptor pressure, leak and p95/p99 evidence is absent.
+
+## Source map
+
+| Path | Responsibility |
+|---|---|
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Poll/load/extract/prepare/cache/missing service |
+| `src/render/m2/m2_mesh_load_pipeline_state.gd` | Pending and completion FIFO ownership |
+| `src/render/m2/m2_mesh_resource_extractor.gd` | First-Mesh and temporary-instance ownership |
+| `src/render/m2/m2_runtime_mesh_finalizer.gd` | Refresh/rebuild/fallback rules |
+| `src/render/m2/m2_raw_model_repository.gd` | Optional native raw M2 boundary |
+| `src/render/m2/m2_mesh_resource_cache_state.gd` | Prepared Mesh ownership |
+| `src/render/m2/m2_prototype_cache_state.gd` | Missing-model outcome ownership |
+| `src/scenes/streaming/streaming_world_loader.gd` | Permit loop and materialization composition |
+| `src/tools/verify_m2_mesh_resource_finalizer.gd` | Polling/preparation/boundary/timing regression |
+
+## Related decisions and references
+
+- [`m2-mesh-load-pipeline-state.md`](m2-mesh-load-pipeline-state.md)
+- [`m2-mesh-resource-cache-state.md`](m2-mesh-resource-cache-state.md)
+- [`m2-mesh-resource-extractor.md`](m2-mesh-resource-extractor.md)
+- [`m2-runtime-mesh-finalizer.md`](m2-runtime-mesh-finalizer.md)
+- [`m2-raw-model-repository.md`](m2-raw-model-repository.md)
+- [`world-renderer.md`](world-renderer.md)
+- [`../../RENDER.md`](../../RENDER.md)
+- [`../../targets/roadmap/02-rendering-and-graphics.md`](../../targets/roadmap/02-rendering-and-graphics.md)
@@ -193,7 +193,8 @@ and native M2 formats are unchanged; no migration or rebake is introduced.
 - `diagnostic_snapshot` exposes four sorted path arrays without Node references.
 - Cached eligibility rejection logging belongs to the cached observer; native
  success logging belongs to the native observer and cached terminal success
-  logging belongs to the animation resource finalizer.
+  logging belongs to the animation resource finalizer. Static terminal missing
+  outcomes are produced by `M2MeshResourceFinalizer`.
 - Existing renderer queue metrics remain unchanged because these tables never
  contributed work counts.
 - Normalized relative path remains the correlation key.
@@ -240,6 +241,7 @@ this state without moving ResourceLoader or builder ownership into cache state.
 | `src/render/m2/m2_prototype_cache_state.gd` | Positive Node ownership, negative path state and shutdown release |
 | `src/render/m2/m2_native_animation_resource_observer.gd` | Animated raw/build and positive/static-only transitions |
 | `src/render/m2/m2_animation_resource_finalizer.gd` | Cached terminal positive/static-only transitions |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Static terminal missing transitions |
 | `src/scenes/streaming/streaming_world_loader.gd` | Normalization, observer order, remaining I/O/fallback adapters |
 | `src/tools/verify_m2_prototype_cache_state.gd` | Admission/identity/lifecycle/source/timing regression |
 | `src/tools/verify_render_runtime_cache_shutdown.gd` | Integrated final-shutdown release regression |
@@ -27,11 +27,13 @@ static or animated Dictionary consumed by existing builders and classifiers.

 ```mermaid
 flowchart LR
-    Loader[StreamingWorldLoader] --> Repository[M2RawModelRepository]
+    MeshFinalizer[M2MeshResourceFinalizer] --> Repository[M2RawModelRepository]
+    Loader[StreamingWorldLoader] --> Repository
    Observer[M2NativeAnimationResourceObserver] --> Repository
    Repository --> File[Extracted M2 file]
    Repository --> Native[ClassDB M2Loader]
    Native --> Raw[Raw Dictionary]
+    Raw --> MeshFinalizer
    Raw --> Loader
    Raw --> Observer
    Loader --> Builder[Existing M2 builders/finalizer]
@@ -55,7 +57,7 @@ renderer policy and other application layers are forbidden.
 | Input | Extracted directory String | Loader configuration | Repository path resolution | Copied value | One call |
 | Input | Already-normalized relative M2 path String | Loader normalization | Repository | Copied value | One call |
 | Input | Extracted `.m2` bytes | Local legal extraction | Native M2Loader | File-owned | Native call |
-| Output | Static raw M2 Dictionary | Native `load_m2` | Loader/finalizer/M2Builder | Fresh native result | One caller operation |
+| Output | Static raw M2 Dictionary | Native `load_m2` | Mesh resource finalizer/M2Builder | Fresh native result | One caller operation |
 | Output | Animated raw M2 Dictionary | Native `load_m2_animated` | Native animation observer/builder | Fresh native result | One caller operation |
 | Output | Empty Dictionary | Repository guards | Loader fallback and prototype outcome adapter | Fresh value | One failed call |

@@ -136,8 +138,9 @@ flowchart TB
 ## Ownership, threading and resources

 - The repository owns only call-local path, native instance and result values.
- The loader owns path normalization and fallback selection; the native observer
-  owns the animated raw-read/build decision;
+- The loader owns path normalization and fallback selection; the Mesh resource
+  finalizer owns static refresh reads, while the native observer owns the
+  animated raw-read/build decision;
  `M2PrototypeCacheState` owns prototype/negative adoption.
 - Native `M2Loader` owns parsing behavior and returns a new Dictionary value.
 - Calls are synchronous on the caller's thread; current renderer callers use the
@@ -215,6 +218,7 @@ measured work packages rather than expansion of this repository.
 | Path | Responsibility |
 |---|---|
 | `src/render/m2/m2_raw_model_repository.gd` | Stateless native class/file/method boundary |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Static refresh repository consumer |
 | `src/render/m2/m2_native_animation_resource_observer.gd` | Animated raw-data consumer and builder adapter |
 | `src/render/m2/m2_prototype_cache_state.gd` | Prototype and negative-result retention |
 | `src/scenes/streaming/streaming_world_loader.gd` | Path normalization, fallback decisions and result consumers |
@@ -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 |
@@ -134,7 +134,8 @@ flowchart TB
 - Cache/pipeline services retain their existing state and resource ownership.
 - Snapshot borrows the exact cached Mesh; observer never frees it.
 - Resource existence/request and GLB inspection run on renderer main thread.
- Finalization and Mesh preparation remain in the loader drain path.
+- `M2MeshResourceFinalizer` performs terminal polling, Resource extraction,
+  Mesh preparation and cache/missing adoption from the loader permit loop.

 ## Errors, cancellation and recovery

@@ -181,7 +182,7 @@ a generic resource framework.
 | Capability | Status | Evidence | Gap |
 |---|---|---|---|
 | Static build lookup/request production | Implemented extraction | Lifecycle/path/source/timing verifier | Asset-backed traversal pending |
-| Static finalize/preparation | Existing loader-owned | Pipeline/finalizer regressions | Later extraction |
+| Static finalize/preparation | Implemented extraction | Mesh resource finalizer verifier | Asset-backed traversal pending |
 | Animated observation | Existing loader-owned | Animation regressions | Separate producer pending |

 ## Known gaps and risks
@@ -197,7 +198,8 @@ a generic resource framework.
 |---|---|
 | `src/render/m2/m2_static_build_resource_observer.gd` | Static cache/request/missing observation |
 | `src/render/m2/m2_build_resource_snapshot.gd` | Typed observation result |
-| `src/scenes/streaming/streaming_world_loader.gd` | Composition, finalize drain and action execution |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Terminal polling, preparation and adoption |
+| `src/scenes/streaming/streaming_world_loader.gd` | Composition, permits and action execution |
 | `src/tools/verify_m2_static_build_resource_observer.gd` | Lifecycle/path/boundary/timing regression |

 ## Related decisions and references
@@ -155,6 +155,7 @@ from externally reading/writing loader-private queue, task, cache and tile-state
 | `M2MeshLoadPipelineState` | Internal M2 async-state service | Owns static Mesh pending request records and terminal finalize FIFO | Renderer main thread; map/session | Empty/duplicate/unknown transitions rejected |
 | `M2MeshResourceCacheState` | Internal M2 Resource cache | Owns prepared static Mesh references by normalized path | Renderer main thread; final shutdown | Empty path/null Mesh rejected; same path replaces |
 | `M2MeshResourceExtractor` | Internal M2 scene/resource service | Selects first Mesh from direct Resource, PackedScene or Node subtree | Renderer main thread; stateless except temporary instance | Invalid/no Mesh returns null; temporary PackedScene root freed |
+| `M2MeshResourceFinalizer` | Internal M2 terminal-I/O service | Polls static requests, extracts/prepares terminal Meshes and publishes cache/missing outcomes | Renderer main thread; stateless across calls | Invalid/failed Resources mark missing; one call pops at most one terminal record |
 | `M2RuntimeMeshFinalizer` | Internal M2 preparation service | Owns refresh version, rebuild classification, M2Builder rebuild and fallback | Renderer main thread; decisions cached until reset | Null returns null; missing/failed rebuild marks and reuses original Mesh |
 | `M2RawModelRepository` | Internal M2 native repository | Reads static/animated raw Dictionaries through exact M2Loader methods | Synchronous; stateless | Invalid/unavailable/non-Dictionary result returns empty Dictionary |
 | `M2PrototypeCacheState` | Internal M2 prototype cache | Owns detached static/animated Nodes and missing/static-only outcomes | Renderer main thread; final shutdown | Invalid admission rejected; first valid prototype wins |
@@ -427,8 +428,9 @@ sequenceDiagram
 - `M2MeshLoadPipelineState` owns static M2 pending Resource paths, opaque
  terminal statuses and completion-order finalize FIFO. The static observer owns
  cache path selection, request admission and initial snapshot adoption. The
-  loader retains ResourceLoader polling/finalize, permits and terminal adoption;
-  prototype cache state owns shared missing outcomes.
+  Mesh resource finalizer owns ResourceLoader polling/finalize and terminal
+  adoption; loader retains permits and composition, while prototype cache state
+  owns shared missing outcomes.
 - `M2AnimationLoadPipelineState` owns animated M2 pending Resource paths, opaque
  terminal statuses and completion-order finalize FIFO. The cached animation
  observer owns allow/deny/path/GLB selection, request admission and initial
@@ -440,11 +442,11 @@ sequenceDiagram
  belong to the sibling cache service and loader respectively.
 - `M2MeshResourceExtractor` owns depth-first first-Mesh selection and temporary
  PackedScene instance destruction. The static observer admits ResourceLoader
-  requests and initial cache/missing adoption; the loader retains polling,
-  terminal adoption and materialization.
+  requests and initial cache/missing adoption; the Mesh resource finalizer owns
+  terminal extraction/adoption, while the loader retains materialization.
 - `M2RuntimeMeshFinalizer` owns refresh version `2`, classifier lifetime,
-  M2Builder rebuild and original-Mesh fallback. The loader loads raw data only
-  after the finalizer reports that a cached Mesh is stale.
+  M2Builder rebuild and original-Mesh fallback. `M2MeshResourceFinalizer` loads
+  raw data only after the runtime finalizer reports that a cached Mesh is stale.
 - `M2RawModelRepository` owns FileAccess/ClassDB availability and the exact
  `load_m2`/`load_m2_animated` calls. The loader retains normalization, fallback
  order and every result consumer; `M2PrototypeCacheState` retains outcomes.
@@ -596,10 +598,11 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | M2 build batch planner | Implemented extraction | Scene-free limit/count/cursor/source/timing contract | Spatial cells and asset-backed p95/p99 remain pending |
 | M2 build dispatch planner | Implemented extraction | Scene-free priority/action/transition/source/timing contract | Resource observation/orchestration and asset-backed traversal remain pending |
 | M2 build resource snapshot | Implemented extraction | Typed identity/adoption/lifetime/source/timing contract | Resource observation service and asset-backed traversal remain pending |
-| M2 static build resource observer | Implemented extraction | Cache/pending/path/request/source/timing contract | Asset-backed traversal and finalize extraction pending |
+| M2 static build resource observer | Implemented extraction | Cache/pending/path/request/source/timing contract | Asset-backed traversal pending |
 | M2 cached animation resource observer | Implemented extraction | Cache/pending/policy/GLB/request/source/timing contract | Asset-backed traversal pending |
 | M2 native animation resource observer | Implemented extraction | Candidate/cache/raw/build/adoption/source/timing contract | Asset-backed traversal/leak/p95/p99 pending |
 | M2 animation resource finalizer | Implemented extraction | Status/FIFO/load/candidate/repair/adoption/source/timing contract | Asset-backed traversal/leak/p95/p99 pending |
+| M2 mesh resource finalizer | Implemented extraction | Status/FIFO/load/extract/prepare/adoption/source/timing contract | Asset-backed traversal/leak/p95/p99 pending |
 | M2 build queue | Implemented extraction | Typed lifecycle/FIFO/progress/lifetime/source/timing contract | Resource dispatch and asset-backed traversal remain pending |
 | M2 animation load pipeline state | Implemented extraction | Synthetic lifecycle/FIFO/source/timing contract | Asset-backed traversal/leak/animation-fidelity/p95/p99 pending |
 | M2 animated scene finalizer | Implemented extraction | Synthetic type/lifetime/material/player/source/timing contract | Asset-backed GLB traversal/material/animation comparison pending |
@@ -681,6 +684,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/render/m2/m2_mesh_load_pipeline_state.gd` | Static M2 pending Resource paths, terminal statuses and finalize FIFO |
 | `src/render/m2/m2_mesh_resource_cache_state.gd` | Prepared static M2 Mesh references and final-shutdown release |
 | `src/render/m2/m2_mesh_resource_extractor.gd` | First-Mesh selection and temporary PackedScene instance lifetime |
+| `src/render/m2/m2_mesh_resource_finalizer.gd` | Static terminal polling, Mesh preparation and cache/missing adoption |
 | `src/render/m2/m2_runtime_mesh_finalizer.gd` | Runtime refresh version, rebuild classification/build and fallback |
 | `src/render/m2/m2_raw_model_repository.gd` | Stateless static/animated native M2 file boundary |
 | `src/render/m2/m2_native_animation_resource_observer.gd` | Native candidate/read/build/cache observation |
@@ -702,6 +706,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/tools/verify_m2_runtime_mesh_rebuild_classifier.gd` | M2 rebuild predicate/cache/boundary/timing regression |
 | `src/tools/verify_m2_animation_load_pipeline_state.gd` | Animated M2 request/terminal/FIFO/boundary/timing regression |
 | `src/tools/verify_m2_animation_resource_finalizer.gd` | Animated M2 polling/load/finalize/adoption/boundary/timing regression |
+| `src/tools/verify_m2_mesh_resource_finalizer.gd` | Static M2 polling/extraction/preparation/adoption/boundary/timing regression |
 | `src/tools/verify_m2_animated_scene_finalizer.gd` | Animated M2 candidate/material/player/lifetime/boundary/timing regression |
 | `src/tools/verify_m2_animation_playback_controller.gd` | Animated M2 phase/selection/playback/native/boundary/timing regression |
 | `src/tools/verify_m2_animated_instance_materializer.gd` | Animated M2 order/render/playback/attachment/boundary/timing regression |
@@ -0,0 +1,182 @@
+class_name M2MeshResourceFinalizer
+extends RefCounted
+
+## Polls static M2 ResourceLoader requests and publishes prepared Mesh outcomes.
+## The caller owns permits, pipeline/cache lifetime and MultiMesh materialization.
+
+var _mesh_resource_extractor: RefCounted
+var _runtime_mesh_finalizer: RefCounted
+var _raw_model_repository: RefCounted
+var _resource_loader_adapter: Object
+
+
+func _init(
+	mesh_resource_extractor: RefCounted,
+	runtime_mesh_finalizer: RefCounted,
+	raw_model_repository: RefCounted,
+	resource_loader_adapter: Object = null
+) -> void:
+	_mesh_resource_extractor = mesh_resource_extractor
+	_runtime_mesh_finalizer = runtime_mesh_finalizer
+	_raw_model_repository = raw_model_repository
+	_resource_loader_adapter = resource_loader_adapter
+
+
+## Moves terminal threaded requests into the pipeline finalize FIFO.
+## Empty resource paths retain the historical immediate missing-model outcome.
+func poll_terminal_requests(
+	load_pipeline_state: RefCounted,
+	prototype_cache_state: RefCounted
+) -> int:
+	if load_pipeline_state == null or prototype_cache_state == null:
+		return 0
+	var completed_request_count := 0
+	var request_records: Array = load_pipeline_state.call(
+		"request_records_snapshot"
+	)
+	for request_variant in request_records:
+		if not (request_variant is Dictionary):
+			continue
+		var request: Dictionary = request_variant
+		var normalized_relative_path := String(request.get("normalized", ""))
+		var resource_path := String(request.get("path", ""))
+		if resource_path.is_empty():
+			load_pipeline_state.call(
+				"discard_request",
+				normalized_relative_path
+			)
+			prototype_cache_state.call(
+				"mark_model_missing",
+				normalized_relative_path
+			)
+			completed_request_count += 1
+			continue
+		var load_status := load_threaded_get_status(resource_path)
+		if (
+			load_status != ResourceLoader.THREAD_LOAD_LOADED
+			and load_status != ResourceLoader.THREAD_LOAD_FAILED
+		):
+			continue
+		load_pipeline_state.call(
+			"complete_request",
+			normalized_relative_path,
+			load_status
+		)
+		completed_request_count += 1
+	return completed_request_count
+
+
+## Pops and finalizes one terminal record. A true result means a record was
+## consumed, including cached, failed and invalid outcomes.
+func finalize_next_resource(
+	load_pipeline_state: RefCounted,
+	mesh_resource_cache_state: RefCounted,
+	prototype_cache_state: RefCounted,
+	extracted_directory: String
+) -> bool:
+	if (
+		load_pipeline_state == null
+		or mesh_resource_cache_state == null
+		or prototype_cache_state == null
+	):
+		return false
+	var terminal_record: Dictionary = load_pipeline_state.call(
+		"pop_finalize_record"
+	)
+	if terminal_record.is_empty():
+		return false
+	var normalized_relative_path := String(
+		terminal_record.get("normalized", "")
+	)
+	if (
+		normalized_relative_path.is_empty()
+		or bool(mesh_resource_cache_state.call(
+			"has_mesh",
+			normalized_relative_path
+		))
+	):
+		return true
+	if int(terminal_record.get(
+		"status",
+		ResourceLoader.THREAD_LOAD_FAILED
+	)) != ResourceLoader.THREAD_LOAD_LOADED:
+		prototype_cache_state.call(
+			"mark_model_missing",
+			normalized_relative_path
+		)
+		return true
+
+	var resource_path := String(terminal_record.get("path", ""))
+	var loaded_resource := load_threaded_get(resource_path)
+	var mesh := _mesh_resource_extractor.call(
+		"extract_first_mesh",
+		loaded_resource
+	) as Mesh
+	if mesh == null:
+		prototype_cache_state.call(
+			"mark_model_missing",
+			normalized_relative_path
+		)
+		return true
+	mesh_resource_cache_state.call(
+		"store_mesh",
+		normalized_relative_path,
+		prepare_mesh_for_runtime(
+			normalized_relative_path,
+			mesh,
+			extracted_directory
+		)
+	)
+	return true
+
+
+## Applies the existing refresh-version/raw-data/rebuild path to one Mesh.
+func prepare_mesh_for_runtime(
+	normalized_relative_path: String,
+	mesh: Mesh,
+	extracted_directory: String
+) -> Mesh:
+	if mesh == null:
+		return null
+	if (
+		_runtime_mesh_finalizer == null
+		or not bool(_runtime_mesh_finalizer.call(
+			"requires_raw_data_for_refresh",
+			mesh
+		))
+	):
+		return mesh
+	var raw_model_data: Dictionary = {}
+	if _raw_model_repository != null:
+		raw_model_data = _raw_model_repository.call(
+			"load_static_model_data",
+			extracted_directory,
+			normalized_relative_path
+		)
+	return _runtime_mesh_finalizer.call(
+		"finalize_mesh",
+		normalized_relative_path,
+		mesh,
+		raw_model_data,
+		extracted_directory
+	) as Mesh
+
+
+## Production ResourceLoader status adapter; injectable in synthetic tests.
+func load_threaded_get_status(resource_path: String) -> int:
+	if _resource_loader_adapter != null:
+		return int(_resource_loader_adapter.call(
+			"load_threaded_get_status",
+			resource_path
+		))
+	return ResourceLoader.load_threaded_get_status(resource_path)
+
+
+## Production ResourceLoader terminal-result adapter; injectable in tests.
+func load_threaded_get(resource_path: String) -> Resource:
+	if _resource_loader_adapter != null:
+		return _resource_loader_adapter.call(
+			"load_threaded_get",
+			resource_path
+		) as Resource
+	return ResourceLoader.load_threaded_get(resource_path)
@@ -0,0 +1 @@
+uid://de4xl1fywvqfw
@@ -108,6 +108,9 @@ const M2_MESH_RESOURCE_CACHE_STATE_SCRIPT := preload(
 const M2_MESH_RESOURCE_EXTRACTOR_SCRIPT := preload(
 	"res://src/render/m2/m2_mesh_resource_extractor.gd"
 )
+const M2_MESH_RESOURCE_FINALIZER_SCRIPT := preload(
+	"res://src/render/m2/m2_mesh_resource_finalizer.gd"
+)
 const STREAMING_TARGET_PLANNER_SCRIPT := preload("res://src/render/streaming/streaming_target_planner.gd")
 const STREAMING_TARGET_POLICY_SCRIPT := preload("res://src/render/streaming/streaming_target_policy.gd")
 const RENDER_BUDGET_SCHEDULER_SCRIPT := preload("res://src/render/streaming/render_budget_scheduler.gd")
@@ -309,6 +312,11 @@ var _m2_raw_model_repository := M2_RAW_MODEL_REPOSITORY_SCRIPT.new()
 var _m2_prototype_cache_state := M2_PROTOTYPE_CACHE_STATE_SCRIPT.new()
 var _m2_mesh_resource_cache_state := M2_MESH_RESOURCE_CACHE_STATE_SCRIPT.new()
 var _m2_mesh_resource_extractor := M2_MESH_RESOURCE_EXTRACTOR_SCRIPT.new()
+var _m2_mesh_resource_finalizer := M2_MESH_RESOURCE_FINALIZER_SCRIPT.new(
+	_m2_mesh_resource_extractor,
+	_m2_runtime_mesh_finalizer,
+	_m2_raw_model_repository
+)
 var _m2_mesh_load_pipeline_state := M2_MESH_LOAD_PIPELINE_STATE_SCRIPT.new()
 var _m2_animation_load_pipeline_state := M2_ANIMATION_LOAD_PIPELINE_STATE_SCRIPT.new()
 var _m2_animated_scene_finalizer := M2_ANIMATED_SCENE_FINALIZER_SCRIPT.new()
@@ -4268,41 +4276,19 @@ func _drain_m2_animation_loads() -> void:


 func _drain_m2_mesh_loads() -> void:
-	for pending in _m2_mesh_load_pipeline_state.request_records_snapshot():
-		var normalized_rel := String(pending.get("normalized", ""))
-		var path: String = String(pending.get("path", ""))
-		if path.is_empty():
-			_m2_mesh_load_pipeline_state.discard_request(normalized_rel)
-			_m2_prototype_cache_state.mark_model_missing(normalized_rel)
-			continue
-		var status := ResourceLoader.load_threaded_get_status(path)
-		if status != ResourceLoader.THREAD_LOAD_LOADED and status != ResourceLoader.THREAD_LOAD_FAILED:
-			continue
-		_m2_mesh_load_pipeline_state.complete_request(normalized_rel, status)
+	_m2_mesh_resource_finalizer.poll_terminal_requests(
+		_m2_mesh_load_pipeline_state,
+		_m2_prototype_cache_state
+	)

 	while _m2_mesh_load_pipeline_state.has_finalize_record() and _render_budget_scheduler.try_consume_permit(
 			RENDER_BUDGET_SCHEDULER_SCRIPT.M2_MESH_FINALIZE):
-		var pending: Dictionary = _m2_mesh_load_pipeline_state.pop_finalize_record()
-		var normalized_rel := String(pending.get("normalized", ""))
-		if (
-			normalized_rel.is_empty()
-			or _m2_mesh_resource_cache_state.has_mesh(normalized_rel)
-		):
-			continue
-		if int(pending.get("status", ResourceLoader.THREAD_LOAD_FAILED)) != ResourceLoader.THREAD_LOAD_LOADED:
-			_m2_prototype_cache_state.mark_model_missing(normalized_rel)
-			continue
-
-		var path := String(pending.get("path", ""))
-		var resource: Resource = ResourceLoader.load_threaded_get(path)
-		var mesh := _m2_mesh_resource_extractor.extract_first_mesh(resource)
-		if mesh != null:
-			_m2_mesh_resource_cache_state.store_mesh(
-				normalized_rel,
-				_prepare_m2_mesh_for_runtime(normalized_rel, mesh)
-			)
-		else:
-			_m2_prototype_cache_state.mark_model_missing(normalized_rel)
+		_m2_mesh_resource_finalizer.finalize_next_resource(
+			_m2_mesh_load_pipeline_state,
+			_m2_mesh_resource_cache_state,
+			_m2_prototype_cache_state,
+			extracted_dir
+		)


 func _process_m2_build_jobs() -> void:
@@ -4606,30 +4592,17 @@ func _normalize_m2_rel_path(rel_path: String) -> String:
 	return normalized_rel


-func _prepare_m2_mesh_for_runtime(normalized_rel: String, mesh: Mesh) -> Mesh:
-	if mesh == null:
-		return null
-	if not _m2_runtime_mesh_finalizer.requires_raw_data_for_refresh(mesh):
-		return mesh
-	var data := _m2_raw_model_repository.load_static_model_data(
-		extracted_dir,
-		normalized_rel
-	)
-	return _m2_runtime_mesh_finalizer.finalize_mesh(
-			normalized_rel,
-			mesh,
-			data,
-			extracted_dir
-	)
-
-
 func _prepare_m2_node_for_runtime(normalized_rel: String, root: Node3D) -> void:
 	if root == null:
 		return
 	for mesh_instance in _m2_animated_scene_finalizer.mesh_instances_in_subtree(root):
 		if mesh_instance == null or mesh_instance.mesh == null:
 			continue
-		var prepared := _prepare_m2_mesh_for_runtime(normalized_rel, mesh_instance.mesh)
+		var prepared := _m2_mesh_resource_finalizer.prepare_mesh_for_runtime(
+			normalized_rel,
+			mesh_instance.mesh,
+			extracted_dir
+		)
 		if prepared != null:
 			mesh_instance.mesh = prepared

@@ -4643,7 +4616,11 @@ func _get_or_load_m2_mesh(rel_path: String) -> Mesh:
 		return null
 	var mesh := _m2_mesh_resource_extractor.find_first_mesh_in_subtree(prototype)
 	if mesh != null and not normalized_rel.is_empty():
-		mesh = _prepare_m2_mesh_for_runtime(normalized_rel, mesh)
+		mesh = _m2_mesh_resource_finalizer.prepare_mesh_for_runtime(
+			normalized_rel,
+			mesh,
+			extracted_dir
+		)
 		_m2_mesh_resource_cache_state.store_mesh(normalized_rel, mesh)
 	return mesh

@@ -6,6 +6,7 @@ extends SceneTree
 const PIPELINE_SCRIPT := preload("res://src/render/m2/m2_mesh_load_pipeline_state.gd")
 const PIPELINE_PATH := "res://src/render/m2/m2_mesh_load_pipeline_state.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
+const RESOURCE_FINALIZER_PATH := "res://src/render/m2/m2_mesh_resource_finalizer.gd"


 func _initialize() -> void:
@@ -86,6 +87,9 @@ 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 loader_source := FileAccess.get_file_as_string(LOADER_PATH)
+	var resource_finalizer_source := FileAccess.get_file_as_string(
+		RESOURCE_FINALIZER_PATH
+	)
 	_expect_true(
 		loader_source.contains("M2_MESH_LOAD_PIPELINE_STATE_SCRIPT.new()"),
 		"loader composes pipeline state",
@@ -105,15 +109,19 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		"two existing clear sites delegate",
 		failures
 	)
-	for retained_loader_rule in [
+	for retained_renderer_rule in [
 		"ResourceLoader.load_threaded_request(",
-		"ResourceLoader.load_threaded_get_status(path)",
-		"ResourceLoader.load_threaded_get(path)",
+		"ResourceLoader.load_threaded_get_status(resource_path)",
+		"ResourceLoader.load_threaded_get(resource_path)",
 		"RENDER_BUDGET_SCHEDULER_SCRIPT.M2_MESH_FINALIZE",
-		"_m2_mesh_resource_cache_state.store_mesh(",
-		"_m2_prototype_cache_state.mark_model_missing(normalized_rel)",
+		"\"store_mesh\"",
+		"\"mark_model_missing\"",
 	]:
-		_expect_true(loader_source.contains(retained_loader_rule), "loader retains %s" % retained_loader_rule, failures)
+		_expect_true(
+			(loader_source + resource_finalizer_source).contains(retained_renderer_rule),
+			"renderer retains %s" % retained_renderer_rule,
+			failures
+		)
 	for forbidden_dependency in [
 		"ResourceLoader.",
 		"WorkerThreadPool.",
@@ -7,6 +7,7 @@ const CACHE_SCRIPT := preload("res://src/render/m2/m2_mesh_resource_cache_state.
 const CACHE_PATH := "res://src/render/m2/m2_mesh_resource_cache_state.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
 const STATIC_OBSERVER_PATH := "res://src/render/m2/m2_static_build_resource_observer.gd"
+const RESOURCE_FINALIZER_PATH := "res://src/render/m2/m2_mesh_resource_finalizer.gd"


 func _initialize() -> void:
@@ -70,6 +71,9 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var cache_source := FileAccess.get_file_as_string(CACHE_PATH)
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
 	var observer_source := FileAccess.get_file_as_string(STATIC_OBSERVER_PATH)
+	var resource_finalizer_source := FileAccess.get_file_as_string(
+		RESOURCE_FINALIZER_PATH
+	)
 	_expect_true(
 		loader_source.contains("M2_MESH_RESOURCE_CACHE_STATE_SCRIPT.new()"),
 		"loader composes Mesh cache state",
@@ -77,7 +81,8 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	)
 	_expect_false(loader_source.contains("var _m2_mesh_cache:"), "legacy Mesh cache removed", failures)
 	_expect_equal(
-		loader_source.count("_m2_mesh_resource_cache_state.store_mesh("),
+		loader_source.count("_m2_mesh_resource_cache_state.store_mesh(")
+		+ resource_finalizer_source.count("\"store_mesh\""),
 		2,
 		"two existing stores delegate",
 		failures
@@ -95,14 +100,18 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		"final shutdown clear delegates",
 		failures
 	)
-	for retained_loader_rule in [
-		"ResourceLoader.load_threaded_get(path)",
-		"_m2_mesh_resource_extractor.extract_first_mesh(resource)",
-		"_prepare_m2_mesh_for_runtime(normalized_rel, mesh)",
-		"_m2_prototype_cache_state.mark_model_missing(normalized_rel)",
+	for retained_renderer_rule in [
+		"ResourceLoader.load_threaded_get(resource_path)",
+		"\"extract_first_mesh\"",
+		"prepare_mesh_for_runtime(",
+		"\"mark_model_missing\"",
 		"_m2_prototype_cache_state.adopt_static_prototype(",
 	]:
-		_expect_true(loader_source.contains(retained_loader_rule), "loader retains %s" % retained_loader_rule, failures)
+		_expect_true(
+			(loader_source + resource_finalizer_source).contains(retained_renderer_rule),
+			"renderer retains %s" % retained_renderer_rule,
+			failures
+		)
 	for forbidden_dependency in [
 		"ResourceLoader.",
 		"FileAccess.",
@@ -6,6 +6,7 @@ extends SceneTree
 const EXTRACTOR_SCRIPT := preload("res://src/render/m2/m2_mesh_resource_extractor.gd")
 const EXTRACTOR_PATH := "res://src/render/m2/m2_mesh_resource_extractor.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
+const RESOURCE_FINALIZER_PATH := "res://src/render/m2/m2_mesh_resource_finalizer.gd"


 func _initialize() -> void:
@@ -94,6 +95,9 @@ func _verify_packed_scene_mesh_and_temporary_lifetime(failures: Array[String]) -
 func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var extractor_source := FileAccess.get_file_as_string(EXTRACTOR_PATH)
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
+	var resource_finalizer_source := FileAccess.get_file_as_string(
+		RESOURCE_FINALIZER_PATH
+	)
 	_expect_true(
 		loader_source.contains("M2_MESH_RESOURCE_EXTRACTOR_SCRIPT.new()"),
 		"loader composes Mesh resource extractor",
@@ -110,7 +114,7 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		failures
 	)
 	_expect_equal(
-		loader_source.count("_m2_mesh_resource_extractor.extract_first_mesh("),
+		resource_finalizer_source.count("\"extract_first_mesh\""),
 		1,
 		"threaded Resource finalization delegates",
 		failures
@@ -121,14 +125,18 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		"synchronous fallback delegates",
 		failures
 	)
-	for retained_loader_rule in [
-		"ResourceLoader.load_threaded_get(path)",
-		"_prepare_m2_mesh_for_runtime(normalized_rel, mesh)",
-		"_m2_mesh_resource_cache_state.store_mesh(",
+	for retained_renderer_rule in [
+		"ResourceLoader.load_threaded_get(resource_path)",
+		"prepare_mesh_for_runtime(",
+		"\"store_mesh\"",
 		"M2_BUILDER_SCRIPT.build(data, extracted_dir)",
-		"_m2_prototype_cache_state.mark_model_missing(normalized_rel)",
+		"\"mark_model_missing\"",
 	]:
-		_expect_true(loader_source.contains(retained_loader_rule), "loader retains %s" % retained_loader_rule, failures)
+		_expect_true(
+			(loader_source + resource_finalizer_source).contains(retained_renderer_rule),
+			"renderer retains %s" % retained_renderer_rule,
+			failures
+		)
 	for forbidden_dependency in [
 		"ResourceLoader.",
 		"FileAccess.",
@@ -0,0 +1,499 @@
+extends SceneTree
+
+const FINALIZER_SCRIPT := preload(
+	"res://src/render/m2/m2_mesh_resource_finalizer.gd"
+)
+const PIPELINE_SCRIPT := preload(
+	"res://src/render/m2/m2_mesh_load_pipeline_state.gd"
+)
+const MESH_CACHE_SCRIPT := preload(
+	"res://src/render/m2/m2_mesh_resource_cache_state.gd"
+)
+const PROTOTYPE_CACHE_SCRIPT := preload(
+	"res://src/render/m2/m2_prototype_cache_state.gd"
+)
+const FINALIZER_PATH := "res://src/render/m2/m2_mesh_resource_finalizer.gd"
+const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
+
+
+class FakeResourceLoaderAdapter extends RefCounted:
+	var statuses: Dictionary = {}
+	var resources: Dictionary = {}
+	var status_paths: Array[String] = []
+	var load_paths: Array[String] = []
+
+	func load_threaded_get_status(resource_path: String) -> int:
+		status_paths.append(resource_path)
+		return int(statuses.get(
+			resource_path,
+			ResourceLoader.THREAD_LOAD_IN_PROGRESS
+		))
+
+	func load_threaded_get(resource_path: String) -> Resource:
+		load_paths.append(resource_path)
+		return resources.get(resource_path, null) as Resource
+
+
+class FakeMeshResourceExtractor extends RefCounted:
+	var mesh_by_resource: Dictionary = {}
+	var resources: Array[Resource] = []
+
+	func extract_first_mesh(resource: Resource) -> Mesh:
+		resources.append(resource)
+		return mesh_by_resource.get(resource, null) as Mesh
+
+
+class FakeRuntimeMeshFinalizer extends RefCounted:
+	var raw_data_required: bool = false
+	var finalized_mesh: Mesh = null
+	var requirement_meshes: Array[Mesh] = []
+	var finalize_calls: Array[Dictionary] = []
+
+	func requires_raw_data_for_refresh(mesh: Mesh) -> bool:
+		requirement_meshes.append(mesh)
+		return raw_data_required
+
+	func finalize_mesh(
+		normalized_relative_path: String,
+		mesh: Mesh,
+		raw_model_data: Dictionary,
+		extracted_directory: String
+	) -> Mesh:
+		finalize_calls.append({
+			"normalized": normalized_relative_path,
+			"mesh": mesh,
+			"raw_model_data": raw_model_data,
+			"extracted_directory": extracted_directory,
+		})
+		return finalized_mesh
+
+
+class FakeRawModelRepository extends RefCounted:
+	var result: Dictionary = {}
+	var calls: Array[Dictionary] = []
+
+	func load_static_model_data(
+		extracted_directory: String,
+		normalized_relative_path: String
+	) -> Dictionary:
+		calls.append({
+			"extracted_directory": extracted_directory,
+			"normalized": normalized_relative_path,
+		})
+		return result
+
+
+class EmptyPathPipeline extends RefCounted:
+	var discarded_path: String = ""
+
+	func request_records_snapshot() -> Array[Dictionary]:
+		return [{"normalized": "world/empty.m2", "path": ""}]
+
+	func discard_request(normalized_relative_path: String) -> bool:
+		discarded_path = normalized_relative_path
+		return true
+
+
+func _initialize() -> void:
+	var failures: Array[String] = []
+	_verify_polling(failures)
+	_verify_empty_path_polling(failures)
+	_verify_terminal_rejections(failures)
+	_verify_current_mesh_adoption(failures)
+	_verify_stale_mesh_preparation(failures)
+	_verify_source_boundaries(failures)
+	var elapsed_milliseconds := _verify_bounded_timing(failures)
+	if not failures.is_empty():
+		for failure in failures:
+			push_error("M2_MESH_RESOURCE_FINALIZER: %s" % failure)
+		quit(1)
+		return
+	print(
+		"M2_MESH_RESOURCE_FINALIZER PASS "
+		+ "cases=31 iterations=1000 elapsed_ms=%.3f" % elapsed_milliseconds
+	)
+	quit(0)
+
+
+func _verify_polling(failures: Array[String]) -> void:
+	var dependencies := _dependencies()
+	var service: RefCounted = dependencies.service
+	var resource_loader: FakeResourceLoaderAdapter = dependencies.resource_loader
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	for request in [
+		["world/pending.m2", "res://pending.tres"],
+		["world/loaded.m2", "res://loaded.tres"],
+		["world/failed.m2", "res://failed.tres"],
+	]:
+		pipeline.call("remember_request", request[0], request[1])
+	resource_loader.statuses = {
+		"res://pending.tres": ResourceLoader.THREAD_LOAD_IN_PROGRESS,
+		"res://loaded.tres": ResourceLoader.THREAD_LOAD_LOADED,
+		"res://failed.tres": ResourceLoader.THREAD_LOAD_FAILED,
+	}
+	_expect_equal(
+		int(service.call("poll_terminal_requests", pipeline, prototype_cache)),
+		2,
+		"two terminal requests completed",
+		failures
+	)
+	_expect_equal(int(pipeline.call("pending_request_count")), 1, "pending retained", failures)
+	_expect_equal(int(pipeline.call("finalize_record_count")), 2, "two finalize records", failures)
+	_expect_string_array(
+		resource_loader.status_paths,
+		["res://pending.tres", "res://loaded.tres", "res://failed.tres"],
+		"status insertion order",
+		failures
+	)
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_empty_path_polling(failures: Array[String]) -> void:
+	var dependencies := _dependencies()
+	var pipeline := EmptyPathPipeline.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	_expect_equal(
+		int(dependencies.service.call(
+			"poll_terminal_requests",
+			pipeline,
+			prototype_cache
+		)),
+		1,
+		"empty resource path completed",
+		failures
+	)
+	_expect_string_equal(
+		pipeline.discarded_path,
+		"world/empty.m2",
+		"empty resource path discarded",
+		failures
+	)
+	_expect_true(
+		bool(prototype_cache.call("is_model_missing", "world/empty.m2")),
+		"empty resource path marks missing",
+		failures
+	)
+	_expect_equal(
+		dependencies.resource_loader.status_paths.size(),
+		0,
+		"empty path skips I/O",
+		failures
+	)
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_terminal_rejections(failures: Array[String]) -> void:
+	var dependencies := _dependencies()
+	var service: RefCounted = dependencies.service
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var mesh_cache: RefCounted = MESH_CACHE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	_expect_false(
+		bool(service.call(
+			"finalize_next_resource",
+			pipeline,
+			mesh_cache,
+			prototype_cache,
+			"res://data/extracted"
+		)),
+		"empty finalize FIFO",
+		failures
+	)
+	_enqueue_terminal(
+		pipeline,
+		"world/failed.m2",
+		"res://failed.tres",
+		ResourceLoader.THREAD_LOAD_FAILED
+	)
+	_expect_true(
+		bool(service.call(
+			"finalize_next_resource", pipeline, mesh_cache,
+			prototype_cache, "res://data/extracted"
+		)),
+		"failed record consumed",
+		failures
+	)
+	_expect_true(
+		bool(prototype_cache.call("is_model_missing", "world/failed.m2")),
+		"failed record marks missing",
+		failures
+	)
+	var cached_mesh := ArrayMesh.new()
+	mesh_cache.call("store_mesh", "world/cached.m2", cached_mesh)
+	_enqueue_terminal(
+		pipeline,
+		"world/cached.m2",
+		"res://cached.tres",
+		ResourceLoader.THREAD_LOAD_LOADED
+	)
+	service.call(
+		"finalize_next_resource", pipeline, mesh_cache,
+		prototype_cache, "res://data/extracted"
+	)
+	_enqueue_terminal(
+		pipeline,
+		"world/null.m2",
+		"res://null.tres",
+		ResourceLoader.THREAD_LOAD_LOADED
+	)
+	service.call(
+		"finalize_next_resource", pipeline, mesh_cache,
+		prototype_cache, "res://data/extracted"
+	)
+	_expect_true(
+		bool(prototype_cache.call("is_model_missing", "world/null.m2")),
+		"null Resource marks missing",
+		failures
+	)
+	_expect_string_array(
+		dependencies.resource_loader.load_paths,
+		["res://null.tres"],
+		"cached record skips terminal get",
+		failures
+	)
+	mesh_cache.call("clear")
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_current_mesh_adoption(failures: Array[String]) -> void:
+	var dependencies := _dependencies()
+	var resource := Resource.new()
+	var mesh := ArrayMesh.new()
+	dependencies.resource_loader.resources["res://current.tres"] = resource
+	dependencies.extractor.mesh_by_resource[resource] = mesh
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var mesh_cache: RefCounted = MESH_CACHE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	_enqueue_terminal(
+		pipeline,
+		"world/current.m2",
+		"res://current.tres",
+		ResourceLoader.THREAD_LOAD_LOADED
+	)
+	_expect_true(
+		bool(dependencies.service.call(
+			"finalize_next_resource", pipeline, mesh_cache,
+			prototype_cache, "res://custom/extracted"
+		)),
+		"current Mesh record consumed",
+		failures
+	)
+	_expect_same(
+		mesh_cache.call("find_mesh", "world/current.m2"),
+		mesh,
+		"current Mesh exact adoption",
+		failures
+	)
+	_expect_equal(dependencies.raw_repository.calls.size(), 0, "current Mesh skips raw", failures)
+	_expect_equal(
+		dependencies.runtime_finalizer.finalize_calls.size(),
+		0,
+		"current Mesh skips finalize",
+		failures
+	)
+	mesh_cache.call("clear")
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_stale_mesh_preparation(failures: Array[String]) -> void:
+	var dependencies := _dependencies()
+	dependencies.runtime_finalizer.raw_data_required = true
+	dependencies.raw_repository.result = {"vertices": [1]}
+	var resource := Resource.new()
+	var stale_mesh := ArrayMesh.new()
+	var prepared_mesh := ArrayMesh.new()
+	dependencies.runtime_finalizer.finalized_mesh = prepared_mesh
+	dependencies.resource_loader.resources["res://stale.tres"] = resource
+	dependencies.extractor.mesh_by_resource[resource] = stale_mesh
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var mesh_cache: RefCounted = MESH_CACHE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	_enqueue_terminal(
+		pipeline,
+		"world/stale.m2",
+		"res://stale.tres",
+		ResourceLoader.THREAD_LOAD_LOADED
+	)
+	dependencies.service.call(
+		"finalize_next_resource", pipeline, mesh_cache,
+		prototype_cache, "res://custom/extracted"
+	)
+	_expect_same(
+		mesh_cache.call("find_mesh", "world/stale.m2"),
+		prepared_mesh,
+		"prepared Mesh adoption",
+		failures
+	)
+	_expect_equal(dependencies.raw_repository.calls.size(), 1, "one raw read", failures)
+	_expect_string_equal(
+		String(dependencies.raw_repository.calls[0].normalized),
+		"world/stale.m2",
+		"raw normalized path",
+		failures
+	)
+	_expect_string_equal(
+		String(dependencies.raw_repository.calls[0].extracted_directory),
+		"res://custom/extracted",
+		"raw extracted directory",
+		failures
+	)
+	_expect_same(
+		dependencies.runtime_finalizer.finalize_calls[0].mesh,
+		stale_mesh,
+		"runtime finalizer source Mesh",
+		failures
+	)
+	_expect_true(
+		dependencies.runtime_finalizer.finalize_calls[0].raw_model_data
+		== dependencies.raw_repository.result,
+		"runtime finalizer raw data",
+		failures
+	)
+	mesh_cache.call("clear")
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_source_boundaries(failures: Array[String]) -> void:
+	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
+	var service_source := FileAccess.get_file_as_string(FINALIZER_PATH)
+	var drain_start := loader_source.find("func _drain_m2_mesh_loads()")
+	var drain_end := loader_source.find("func _process_m2_build_jobs()", drain_start)
+	var drain_source := loader_source.substr(drain_start, drain_end - drain_start)
+	_expect_true(
+		drain_source.contains("_m2_mesh_resource_finalizer.poll_terminal_requests("),
+		"loader delegates polling",
+		failures
+	)
+	_expect_true(
+		drain_source.contains("_m2_mesh_resource_finalizer.finalize_next_resource("),
+		"loader delegates terminal finalization",
+		failures
+	)
+	for removed_token in [
+		"ResourceLoader.load_threaded_get_status",
+		"ResourceLoader.load_threaded_get(",
+		"_m2_mesh_resource_extractor.extract_first_mesh",
+		"_m2_mesh_resource_cache_state.store_mesh",
+		"_m2_prototype_cache_state.mark_model_missing",
+	]:
+		_expect_false(
+			drain_source.contains(removed_token),
+			"loader drain omits %s" % removed_token,
+			failures
+		)
+	_expect_false(
+		loader_source.contains("func _prepare_m2_mesh_for_runtime("),
+		"legacy loader preparation removed",
+		failures
+	)
+	for required_token in [
+		"ResourceLoader.load_threaded_get_status",
+		"ResourceLoader.load_threaded_get(",
+		"\"extract_first_mesh\"",
+		"\"store_mesh\"",
+		"\"mark_model_missing\"",
+		"\"load_static_model_data\"",
+		"\"finalize_mesh\"",
+	]:
+		_expect_true(
+			service_source.contains(required_token),
+			"service owns %s" % required_token,
+			failures
+		)
+
+
+func _verify_bounded_timing(failures: Array[String]) -> float:
+	var dependencies := _dependencies()
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	var started_microseconds := Time.get_ticks_usec()
+	for iteration in range(1000):
+		dependencies.service.call(
+			"poll_terminal_requests",
+			pipeline,
+			prototype_cache
+		)
+	var elapsed_milliseconds := float(
+		Time.get_ticks_usec() - started_microseconds
+	) / 1000.0
+	_expect_true(elapsed_milliseconds < 1000.0, "empty polling bounded", failures)
+	prototype_cache.call("clear_and_release")
+	return elapsed_milliseconds
+
+
+func _dependencies() -> Dictionary:
+	var resource_loader := FakeResourceLoaderAdapter.new()
+	var extractor := FakeMeshResourceExtractor.new()
+	var runtime_finalizer := FakeRuntimeMeshFinalizer.new()
+	var raw_repository := FakeRawModelRepository.new()
+	return {
+		"resource_loader": resource_loader,
+		"extractor": extractor,
+		"runtime_finalizer": runtime_finalizer,
+		"raw_repository": raw_repository,
+		"service": FINALIZER_SCRIPT.new(
+			extractor,
+			runtime_finalizer,
+			raw_repository,
+			resource_loader
+		),
+	}
+
+
+func _enqueue_terminal(
+	pipeline: RefCounted,
+	normalized_relative_path: String,
+	resource_path: String,
+	status: int
+) -> void:
+	pipeline.call("remember_request", normalized_relative_path, resource_path)
+	pipeline.call("complete_request", normalized_relative_path, status)
+
+
+func _expect_true(condition: bool, label: String, failures: Array[String]) -> void:
+	if not condition:
+		failures.append(label)
+
+
+func _expect_false(condition: bool, label: String, failures: Array[String]) -> void:
+	_expect_true(not condition, label, failures)
+
+
+func _expect_same(
+	actual: Variant,
+	expected: Variant,
+	label: String,
+	failures: Array[String]
+) -> void:
+	_expect_true(is_same(actual, expected), label, failures)
+
+
+func _expect_equal(
+	actual: int,
+	expected: int,
+	label: String,
+	failures: Array[String]
+) -> void:
+	if actual != expected:
+		failures.append("%s expected=%d actual=%d" % [label, expected, actual])
+
+
+func _expect_string_equal(
+	actual: String,
+	expected: String,
+	label: String,
+	failures: Array[String]
+) -> void:
+	if actual != expected:
+		failures.append("%s expected=%s actual=%s" % [label, expected, actual])
+
+
+func _expect_string_array(
+	actual: Array[String],
+	expected: Array[String],
+	label: String,
+	failures: Array[String]
+) -> void:
+	if actual != expected:
+		failures.append("%s expected=%s actual=%s" % [label, expected, actual])
@@ -0,0 +1 @@
+uid://by0rlnw5g8hjr
@@ -7,6 +7,7 @@ const REPOSITORY_PATH := "res://src/render/m2/m2_raw_model_repository.gd"
 const NATIVE_OBSERVER_PATH := (
 	"res://src/render/m2/m2_native_animation_resource_observer.gd"
 )
+const MESH_FINALIZER_PATH := "res://src/render/m2/m2_mesh_resource_finalizer.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"


@@ -60,6 +61,7 @@ func _verify_rejected_inputs(failures: Array[String]) -> void:
 func _verify_ownership_boundaries(failures: Array[String]) -> void:
 	var repository_source := FileAccess.get_file_as_string(REPOSITORY_PATH)
 	var native_observer_source := FileAccess.get_file_as_string(NATIVE_OBSERVER_PATH)
+	var mesh_finalizer_source := FileAccess.get_file_as_string(MESH_FINALIZER_PATH)
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
 	_expect_true(
 		loader_source.contains("M2_RAW_MODEL_REPOSITORY_SCRIPT.new()"),
@@ -67,7 +69,8 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		failures
 	)
 	_expect_equal(
-		loader_source.count("_m2_raw_model_repository.load_static_model_data("),
+		loader_source.count("_m2_raw_model_repository.load_static_model_data(")
+		+ mesh_finalizer_source.count("\"load_static_model_data\""),
 		2,
 		"two static callers delegate",
 		failures
@@ -62,7 +62,8 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  `M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-001`,
  `M03-RND-M2-CACHED-ANIMATION-RESOURCE-OBSERVER-001`,
  `M03-RND-M2-NATIVE-ANIMATION-RESOURCE-OBSERVER-001`,
-  `M03-RND-M2-ANIMATION-RESOURCE-FINALIZER-001`
+  `M03-RND-M2-ANIMATION-RESOURCE-FINALIZER-001`,
+  `M03-RND-M2-MESH-RESOURCE-FINALIZER-001`
 - Commands: dedicated scheduler/planner/facade/focus/coordinate/manifest/shutdown
  headless verifiers; Godot cold editor parse; coordination, documentation and diff gates.
 - Results: scheduler `cases=6 iterations=20000 elapsed_ms=10.216`; planner
@@ -317,6 +318,13 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  All 58 autonomous headless regressions passed; internal-access remained `30`,
  documentation covered `45` module specifications, coordination retained `34`
  historical expired-claim warnings and checkpoint dry-run kept all `7/7` plans.
+  M2 Mesh resource finalizer passed `cases=31 iterations=1000
+  elapsed_ms=0.767` with insertion-order status polling, loaded/failed FIFO,
+  empty-path discard, cached/null/current/stale Mesh outcomes, exact dependency
+  arguments, raw-read suppression and loader source boundaries. All 59 autonomous
+  headless regressions passed; internal-access remained `30`, documentation
+  covered `46` module specifications, coordination retained `34` historical
+  expired-claim warnings and checkpoint dry-run kept all `7/7` plans.
  M02 terrain-query regression
  remained green (13 pre-existing expired M00 claim warnings).
 - Fidelity comparison: all 16 historical operation limits and drain sites were
@@ -400,14 +408,16 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  M2 stale-cache rebuild selection retains the same positive billboard flag/
  vertex-count tests, referenced non-identity UV rotation, exclusive
  `0.000001` speed threshold, four-stage cap and first-decision-per-path cache
-  lifetime. Raw loading, material refresh version, M2Builder rebuild/fallback and
-  Mesh adoption remain loader-owned.
+  lifetime. Material refresh version and M2Builder rebuild/fallback remain in
+  the runtime finalizer; static raw loading and Mesh adoption now belong to the
+  Mesh resource finalizer.
  Static M2 mesh pending requests preserve normalized-path dedupe and Dictionary
  insertion polling order; loaded/failed transitions preserve completion-order
  finalization FIFO and opaque statuses. All three pending-plus-finalize metrics,
-  both clear sites and shutdown ResourceLoader drain order are unchanged; cache
-  path selection, I/O, permits and adoption decisions remain loader-owned;
-  missing outcomes now belong to the prototype cache state.
+  both clear sites and shutdown ResourceLoader drain order are unchanged. Cache
+  path selection/request admission and permits remain loader-owned; terminal
+  I/O and Mesh/missing adoption belong to the Mesh resource finalizer, with
+  missing outcomes retained by prototype cache state.
  Animated M2 pending requests preserve normalized-path dedupe and Dictionary
  insertion polling order; loaded/failed transitions preserve completion-order
  finalization FIFO and opaque statuses. All three pending-plus-finalize metrics,
@@ -489,6 +499,8 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  adapters plus synthetic lifecycle and exact-dependency regression fixtures,
  cached M2 animation resource finalizer and loader/pipeline/scene-finalizer/
  prototype-cache adapters plus synthetic terminal-I/O regression fixtures,
+  static M2 Mesh resource finalizer and loader/pipeline/extractor/runtime-finalizer/
+  raw-repository/cache adapters plus synthetic terminal-I/O regression fixtures,
  expanded facade/internal-access/coordinate verifiers; work-package claims and this evidence.
 - Remaining risks: worker concurrency and stale-result validation remain
  streamer-owned; cancellation stops new permits but does not interrupt
@@ -505,8 +517,9 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  culling-driven spatial-cell grouping; M2 rebuild classification and static
  request/finalize bookkeeping, prepared Mesh cache ownership and first-Mesh
  traversal plus refresh/rebuild/fallback, raw native M2 I/O and prototype/
-  negative cache state are separated, but synchronous native parsing/build and
-  Mesh adoption remain in the loader call path; cached animation eligibility/
+  negative cache state are separated; static Mesh terminal polling/adoption is
+  also separated, but synchronous native parsing/build remains in its
+  main-thread service call path; cached animation eligibility/
  request admission is extracted while terminal ResourceLoader polling remains;
  raw
  animated-instance materialization is now separated but remains synchronous
@@ -518,8 +531,8 @@ Runtime и Editor используют facade; planner/scheduler тестиру
  batching still needs culling/performance evidence; typed M2 pending state is
  separated and dispatch decisions are explicit; static and cached-animation
  observers produce typed per-operation state, including native observation;
-  animation terminal ResourceLoader drain is extracted, while action execution,
-  material-prototype lookup, root cleanup and static Mesh finalize drain remain loader-owned;
+  animation and static Mesh terminal ResourceLoader drains are extracted, while
+  action execution, material-prototype lookup and root cleanup remain loader-owned;
  WMO ResourceLoader/FileAccess I/O, live fallback and group materialization
  remain in the loader;
  asset-backed WMO placement/portal/material/leak/p95/p99 evidence remains pending;