refactor(M03): extract M2 prototype cache state

RENDER.md

@@ -40,6 +40,7 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 - `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.
 - `src/render/m2/m2_runtime_mesh_finalizer.gd` - refresh version, classifier lifetime, M2Builder rebuild and original-Mesh fallback.
+- `src/render/m2/m2_prototype_cache_state.gd` - shutdown-lifetime static/animated prototype Nodes and missing/static-only path outcomes.
 - `src/scenes/streaming/eastern_kingdoms_streaming.tscn` - текущая сцена для проверки Azeroth/Eastern Kingdoms.
 - `addons/mpq_extractor/loaders/adt_builder.gd` - сборка ADT terrain, control splat материалов и MH2O liquids.
 - `addons/mpq_extractor/loaders/m2_builder.gd` - сборка статического M2 mesh/material.
@@ -1090,8 +1091,9 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - The cache retains map-refresh lifetime and clears only at the existing final
   runtime-cache shutdown site after asynchronous work is drained.
 - `StreamingWorldLoader` still owns normalization, `.tscn`/`.glb` selection,
-  ResourceLoader I/O, Mesh extraction, material refresh/rebuild, shared missing
-  and prototype/animated caches, permits and MultiMesh materialization.
+  ResourceLoader I/O, Mesh extraction, material refresh/rebuild, cache adoption
+  decisions, permits and MultiMesh materialization. Prototype/negative state is
+  now a sibling cache service.
 - Cache formats, refresh metadata, profiles and visible output are unchanged.
   Synthetic cache timing is not asset-backed memory/leak or p95/p99 evidence.
 
@@ -1115,8 +1117,8 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
   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.
 - Billboard/UV-rotation predicates, rebuild extraction, metadata key and failure
-  fallback are unchanged. Cache adoption, missing state, permits and MultiMesh
-  materialization remain loader-owned.
+  fallback are unchanged. Cache adoption decisions, permits and MultiMesh
+  materialization remain loader-owned; negative outcomes belong to prototype state.
 - Synthetic triangle rebuild/fallback timing is not asset-backed material,
   descriptor-pressure/leak or p95/p99 evidence.
 
@@ -1127,13 +1129,29 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
   `load_m2_animated` raw Dictionaries.
 - `StreamingWorldLoader` delegates the stale-Mesh refresh, static prototype and
   native animated prototype reads. It retains normalization, `.tscn/.glb`
-  fallback order, missing/prototype caches, builders, permits and Node/Mesh use.
+  fallback order, builders, permits and Node/Mesh use; prototype/negative state
+  is now isolated in `M2PrototypeCacheState`.
 - The repository retains no path, native object or parsed data. Empty paths,
   absent files/classes/methods and invalid results produce the same empty-value
   fallback contract; path join/globalization and native method names are exact.
 - No cache format, parser, material, geometry, animation or visible rule changed.
   Synthetic missing-input timing is not asset-backed I/O/p95/p99 or fidelity evidence.
 
+## 2026-07-17 M2 Prototype Cache State
+
+- `M2PrototypeCacheState` now owns the exact static and animated prototype Node
+  references plus missing-model and static-animation negative path outcomes.
+- Sync static, native animated, threaded GLB animation, Mesh finalize and
+  material-prototype paths delegate lookup/adoption/negative transitions to the
+  service. First valid prototype remains canonical for each normalized path.
+- Map refresh still retains all four states. Final shutdown still occurs after
+  asynchronous drain and now calls one idempotent release operation that frees
+  detached prototypes, queues defensive in-tree Nodes and clears path outcomes.
+- `StreamingWorldLoader` retains normalization, ResourceLoader/native I/O,
+  builders, animation policy, fallback order, permits and materialization.
+- No cache format, visible rule or profile changed. Synthetic ownership/timing
+  evidence is not an asset-backed traversal/leak/p95/p99 or fidelity claim.
+
 ## 2026-07-17 WMO Placement Resolver Extraction
 
 - `WmoPlacementResolver` now owns lowercase/slash cache-key normalization,