render: extract static M2 build resource observer

RENDER.md

@@ -43,6 +43,7 @@ Paired run 2026-07-11 подтвердил крупный coordinate/placement g
 - `src/render/m2/m2_build_queue.gd` / `m2_build_job.gd` - typed pending M2 jobs, FIFO/stale tile keys, grouped-transform references and progress cursors without engine destruction.
 - `src/render/m2/m2_build_dispatch_planner.gd` - pure animation/static wait, materialization and missing-model advance decision.
 - `src/render/m2/m2_build_resource_snapshot.gd` - typed per-step animated/static resource observations without engine destruction.
+- `src/render/m2/m2_static_build_resource_observer.gd` - static Mesh cache lookup, threaded request selection and missing transition.
 - `src/render/m2/m2_animation_load_pipeline_state.gd` - animated M2 threaded-load request records and completion-order finalize FIFO without I/O or Node ownership.
 - `src/render/m2/m2_mesh_load_pipeline_state.gd` - static M2 threaded-load request records, terminal statuses and completion-order finalize FIFO without I/O or Mesh ownership.
 - `src/render/m2/m2_mesh_resource_cache_state.gd` - normalized-path prepared static M2 Mesh references with final-shutdown lifetime.
@@ -1084,6 +1085,15 @@ $exe = Join-Path $env:TEMP 'godot-4.6.1-openwc\Godot_v4.6.1-stable_win64.exe'
 - ResourceLoader/cache requests, permit/cursor transitions, engine lifetime,
   cache formats, profiles and visible rules remain unchanged.
 
+## 2026-07-18 M2 Static Build Resource Observer Extraction
+
+- `M2StaticBuildResourceObserver` now owns prepared-Mesh lookup, existing-request
+  detection, `.tscn`-before-`.glb` candidate selection, pivot-prefix GLB rejection,
+  threaded request admission and terminal missing transition for build jobs.
+- The observer fills `M2BuildResourceSnapshot`; the loader retains animation
+  observation, finalize drains, materialization, permits and engine lifetime.
+- Candidate order, request errors, cache formats, profiles and visuals are unchanged.
+
 ## 2026-07-17 M2 Runtime Mesh Rebuild Classifier Extraction
 
 - `M2RuntimeMeshRebuildClassifier` now owns the memoized decision used when a

docs/modules/README.md

@@ -23,6 +23,7 @@
 | M2 build batch planner | Implemented extraction | [`m2-build-batch-planner.md`](m2-build-batch-planner.md) |
 | M2 build dispatch planner | Implemented extraction | [`m2-build-dispatch-planner.md`](m2-build-dispatch-planner.md) |
 | M2 build resource snapshot | Implemented extraction | [`m2-build-resource-snapshot.md`](m2-build-resource-snapshot.md) |
+| M2 static build resource observer | Implemented extraction | [`m2-static-build-resource-observer.md`](m2-static-build-resource-observer.md) |
 | M2 build queue | Implemented extraction | [`m2-build-queue.md`](m2-build-queue.md) |
 | M2 static batch materializer | Implemented extraction | [`m2-static-batch-materializer.md`](m2-static-batch-materializer.md) |
 | M2 runtime mesh rebuild classifier | Implemented extraction | [`m2-runtime-mesh-rebuild-classifier.md`](m2-runtime-mesh-rebuild-classifier.md) |

docs/modules/m2-build-resource-snapshot.md

@@ -187,9 +187,9 @@ queue/hitch metrics remain unchanged.
 
 ## Extension points
 
-A later resource-observation service may produce this snapshot while moving
-ResourceLoader/cache request ownership out of the loader. The value contract
-must remain independent of that service and of generic callback frameworks.
+`M2StaticBuildResourceObserver` now produces the static phase. A later animated
+observer may produce the first phase. The value contract remains independent of
+both producers and of generic callback frameworks.
 
 ## Capability status
 
@@ -197,7 +197,8 @@ must remain independent of that service and of generic callback frameworks.
 |---|---|---|---|
 | Typed per-step M2 resource observation | Implemented extraction | Identity/adoption/lifetime/source/timing verifier | Asset-backed traversal pending |
 | Dispatch decision | Implemented separately | Dispatch planner verifier | Asset-backed traversal pending |
-| Resource lookup/request execution | Loader-owned | Cache/pipeline regressions | Service extraction pending |
+| Static lookup/request execution | Implemented separately | Static observer verifier | Asset-backed traversal pending |
+| Animated lookup/request execution | Loader-owned | Animation regressions | Service extraction pending |
 | Engine lifetime/materialization | Loader/materializer-owned | Lifetime/materializer regressions | GPU/p95/p99 evidence pending |
 
 ## Known gaps and risks
@@ -213,7 +214,8 @@ must remain independent of that service and of generic callback frameworks.
 |---|---|
 | `src/render/m2/m2_build_resource_snapshot.gd` | Typed per-step resource observations and diagnostics |
 | `src/render/m2/m2_build_dispatch_planner.gd` | Snapshot-to-action planning |
-| `src/scenes/streaming/streaming_world_loader.gd` | Resource observation/request execution and materializer borrowing |
+| `src/render/m2/m2_static_build_resource_observer.gd` | Static snapshot production and requests |
+| `src/scenes/streaming/streaming_world_loader.gd` | Animated observation/request execution and materializer borrowing |
 | `src/tools/verify_m2_build_resource_snapshot.gd` | Identity/adoption/lifetime/boundary/timing regression |
 
 ## Related decisions and references

docs/modules/m2-mesh-load-pipeline-state.md

@@ -206,7 +206,8 @@ rebuild policy are unchanged; no migration or rebake is required.
 | Capability | Status | Evidence | Gap/next step |
 |---|---|---|---|
 | Static M2 request/finalize state | Implemented extraction | Contract/source/timing verifier | Asset-backed long traversal pending |
-| ResourceLoader I/O | Existing loader-owned | Shutdown/material regressions | I/O adapter extraction optional |
+| 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 |
 | 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 |

docs/modules/m2-mesh-resource-cache-state.md

@@ -186,7 +186,7 @@ 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 | ResourceLoader I/O remains loader-owned |
+| M2 Mesh request lifecycle | Implemented extraction | Pipeline state verifier | Finalize polling remains loader-owned |
 | 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 |
 

docs/modules/m2-static-build-resource-observer.md

@@ -0,0 +1,209 @@
+# M2 Static Build Resource Observer
+
+## Metadata
+
+| Field | Value |
+|---|---|
+| Status | Implemented extraction |
+| Target/work package | M03 / `M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-001` |
+| Owners | Static build Mesh lookup, request selection and missing transition |
+| Last verified | Worktree `work/sindo-main-codex/m03-m2-static-build-resource-observer`, 2026-07-18 |
+| Profiles/capabilities | Existing static MultiMesh M2 build path |
+
+## Purpose
+
+Produce the static phase of `M2BuildResourceSnapshot`: reuse a prepared Mesh,
+wait for an existing request, start the first eligible cache request, or record
+a terminal missing model while preserving historical path and GLB rules.
+
+## Non-goals
+
+- Observe animated/native prototypes or finalize threaded loads.
+- Own/free Meshes, Nodes, cache entries or snapshot lifetime.
+- Materialize instances, plan batches, rotate queues or consume permits.
+- Change cache format, candidate order, profiles or visible output.
+
+## Context and boundaries
+
+```mermaid
+flowchart LR
+    Loader[StreamingWorldLoader] --> Observer[M2StaticBuildResourceObserver]
+    MeshCache[M2MeshResourceCacheState] --> Observer
+    Missing[M2PrototypeCacheState] --> Observer
+    Pipeline[M2MeshLoadPipelineState] --> Observer
+    Observer --> Snapshot[M2BuildResourceSnapshot]
+    Snapshot --> Dispatch[M2BuildDispatchPlanner]
+```
+
+## Public API
+
+| Symbol | Kind | Purpose | Errors |
+|---|---|---|---|
+| `observe(snapshot, path, cache_dir, mesh_cache, prototype_cache, pipeline)` | Command/query | Adopt cached/pending/requested/missing static result | Invalid inputs return `rejected` |
+| `cache_resource_paths(cache_dir, path, extensions)` | Pure query | Return unique historical nested/lowercase/basename candidates | Empty values yield fewer/empty candidates |
+| `glb_animation_schema(path)` | Read query | Read OpenWC schema marker from GLB JSON | Invalid/missing GLB returns empty String |
+| `OUTCOME_*` | Constants | Stable diagnostic transition identifiers | None |
+
+## Inputs and outputs
+
+| Direction | Data | Producer | Consumer | Ownership/lifetime |
+|---|---|---|---|---|
+| Input | Normalized M2 path/cache directory | Loader | Observer | Copied Strings; one observation |
+| Input | Mesh/missing/request states | M2 state services | Observer | Borrowed services; map/session |
+| Input/output | Resource snapshot | Loader | Observer/dispatch/materializer | Borrowed; one build operation |
+| Output | Cached Mesh or missing/pending values | Observer | Snapshot | Exact borrowed Mesh/scalars |
+| Output | Threaded request record | Observer | Mesh pipeline | Pipeline-owned path record |
+| Output | Outcome StringName | Observer | Tests/future diagnostics | Immutable scalar |
+
+## Data flow
+
+```mermaid
+flowchart TD
+    Start[Observe static path] --> Cached{Mesh cached?}
+    Cached -->|yes| AdoptMesh[Adopt exact Mesh; cached]
+    Cached -->|no| Missing{Already missing?}
+    Missing -->|yes| AdoptMissing[Adopt missing]
+    Missing -->|no| Pending{Request pending?}
+    Pending -->|yes| AdoptPending[Adopt unresolved; pending]
+    Pending -->|no| Candidates[Generate tscn then glb candidates]
+    Candidates --> Eligible{Exists and not pivot-prefix GLB?}
+    Eligible -->|yes| Request[Threaded request]
+    Request -->|OK or busy| Remember[Remember request; requested]
+    Eligible -->|none/error| MarkMissing[Mark/adopt missing]
+```
+
+## Lifecycle/state
+
+```mermaid
+stateDiagram-v2
+    [*] --> Observing
+    Observing --> Cached
+    Observing --> Pending
+    Observing --> Requested
+    Observing --> Missing
+    Observing --> Rejected
+    Cached --> [*]
+    Pending --> [*]
+    Requested --> [*]
+    Missing --> [*]
+    Rejected --> [*]
+```
+
+## Main sequence
+
+```mermaid
+sequenceDiagram
+    participant L as StreamingWorldLoader
+    participant O as StaticBuildResourceObserver
+    participant C as Mesh/prototype cache state
+    participant P as MeshLoadPipelineState
+    participant R as ResourceLoader
+    participant S as M2BuildResourceSnapshot
+    L->>O: observe(snapshot, path, cache_dir, states)
+    O->>C: cached/missing lookup
+    alt cache hit or missing
+        O->>S: adopt static observation
+    else pending
+        O->>P: has_request
+        O->>S: adopt unresolved observation
+    else request candidate
+        O->>R: exists + load_threaded_request
+        O->>P: remember_request
+        O->>S: adopt unresolved observation
+    end
+```
+
+## Dependency diagram
+
+```mermaid
+flowchart TB
+    Observer[M2StaticBuildResourceObserver] --> ResourceLoader
+    Observer --> FileAccess[GLB header/JSON read]
+    Observer --> MeshCache[M2MeshResourceCacheState]
+    Observer --> PrototypeCache[M2PrototypeCacheState]
+    Observer --> Pipeline[M2MeshLoadPipelineState]
+    Observer --> Snapshot[M2BuildResourceSnapshot]
+    Observer -. no dependency .-> SceneTree
+    Observer -. no dependency .-> Materializers
+    Observer -. no dependency .-> Scheduler
+```
+
+## Ownership, threading and resources
+
+- Observer retains no request, cache, snapshot or engine reference.
+- 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.
+
+## Errors, cancellation and recovery
+
+| State | Behavior | Recovery |
+|---|---|---|
+| Invalid dependency/path | Return `rejected`; no mutation | Correct composition |
+| Existing request | Return `pending`; no duplicate request | Retry when queue rotates |
+| Pivot-prefix GLB | Skip as static candidate | Continue next candidate |
+| Request error | Stop historical search and mark missing | Later reset/new session |
+| No candidate | Mark/adopt terminal missing | Cache content becomes available in new session |
+| Tile cancellation | Observer retains nothing | Loader/queue cancellation remains authoritative |
+
+## Configuration and capabilities
+
+The observer consumes existing `m2_cache_dir`. It adds no profile, cache version,
+batch, visibility, shadow or scheduler setting.
+
+## Persistence, cache and migration
+
+No new persistence is introduced. Existing `.tscn/.glb` layout, pipeline records
+and missing-cache lifetime are unchanged; no rebake is required.
+
+## Diagnostics and observability
+
+Returned outcomes distinguish rejected/cached/pending/requested/missing without
+logging. Existing queue and hitch metrics remain unchanged.
+
+## Verification
+
+- Dedicated verifier covers invalid, cached identity, missing, pending, path
+  order/deduplication, absent GLB schema, source ownership and bounded timing.
+- Snapshot/dispatch/pipeline/cache/shutdown/facade/internal-access/checkpoint
+  regressions protect adjacent behavior.
+- No original-client visual claim is made; this is bookkeeping/I/O extraction.
+
+## Extension points
+
+Animated/native observation may become a separate producer of the animation
+phase. Shared cache candidate/GLB inspection can later be reused without adding
+a generic resource framework.
+
+## Capability status
+
+| 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 |
+| Animated observation | Existing loader-owned | Animation regressions | Separate producer pending |
+
+## Known gaps and risks
+
+- Successful request behavior is protected by source plus existing pipeline
+  tests; starting an undrained asynchronous request in the unit fixture would leak.
+- GLB schema parser reads synchronously, matching the previous loader behavior.
+- Private traversal, p95/p99, leak and visual evidence remain unavailable.
+
+## Source map
+
+| Path | Responsibility |
+|---|---|
+| `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/tools/verify_m2_static_build_resource_observer.gd` | Lifecycle/path/boundary/timing regression |
+
+## Related decisions and references
+
+- [`m2-build-resource-snapshot.md`](m2-build-resource-snapshot.md)
+- [`m2-mesh-load-pipeline-state.md`](m2-mesh-load-pipeline-state.md)
+- [`m2-mesh-resource-cache-state.md`](m2-mesh-resource-cache-state.md)
+- [`world-renderer.md`](world-renderer.md)
+- [`../../RENDER.md`](../../RENDER.md)

docs/modules/world-renderer.md

@@ -142,6 +142,7 @@ from externally reading/writing loader-private queue, task, cache and tile-state
 | `M2BuildBatchPlanner.plan_batch` | Internal pure M2 service | Selects static/animated batch count and next group cursor | Main/any thread; stateless | Non-positive selected limit clamps to one; empty range completes |
 | `M2BuildDispatchPlanner.plan_step` | Internal pure M2 service | Selects wait, animated/static materialization or no-Node advancement from observed resource state | Main/any thread; stateless | Pending animation has priority; unresolved static Mesh waits |
 | `M2BuildResourceSnapshot` | Internal M2 value contract | Carries per-step normalized path, animated/static references and pending/missing observations | Renderer main thread; one build operation | Values retained exactly; release never frees resources |
+| `M2StaticBuildResourceObserver.observe` | Internal M2 I/O service | Produces cached/pending/requested/missing static snapshot phase | Renderer main thread; stateless | Invalid composition rejected; no candidate marks missing |
 | `M2BuildQueue` / `M2BuildJob` | Internal M2 pending-state service | Own typed root/groups/cursor jobs and FIFO/stale tile keys | Renderer main thread; map session | Invalid enqueue rejected; stale keys drain independently of jobs |
 | `M2StaticBatchMaterializer.materialize_batch` | Internal M2 scene-materialization service | Builds and attaches one prepared-Mesh MultiMesh transform slice | Renderer main thread; stateless after each call | Invalid/empty input returns null; bounds are caller precondition |
 | `M2RuntimeMeshRebuildClassifier` | Internal memoized M2 service | Detects billboard/UV-rotation metadata requiring stale cached-mesh rebuild | Renderer main thread; cached until reset | Invalid variants/indices skipped; first path decision wins |
@@ -393,9 +394,10 @@ sequenceDiagram
   without controlling engine lifetime.
   `M2BuildQueue` owns typed pending jobs, FIFO/stale keys, grouped-transform
   references and group/offset/serial cursors without freeing engine objects.
-  `M2StaticBatchMaterializer` owns static MultiMesh construction/attachment;
-  the loader retains resource observation/requests, action execution,
-  cursor adoption, root cleanup, budgets and Editor ownership.
+  `M2StaticBuildResourceObserver` owns static Mesh lookup/request admission and
+  snapshot adoption. `M2StaticBatchMaterializer` owns static MultiMesh
+  construction/attachment; the loader retains animated observation/requests,
+  action execution, cursor adoption, root cleanup, budgets and Editor ownership.
 - `WmoPlacementResolver` is stateless and owns only call-local cache-key,
   identity and transform values. `WmoPlacementRegistry` owns only placement-key
   reference sets. `WmoRenderBuildStepPlanner` owns only a call-local operation
@@ -416,15 +418,17 @@ sequenceDiagram
   for billboard/UV-rotation material refresh and is composed by the runtime Mesh
   finalizer. The raw repository loads value data; loader retains Mesh adoption.
 - `M2MeshLoadPipelineState` owns static M2 pending Resource paths, opaque
-  terminal statuses and completion-order finalize FIFO. The loader retains cache
-  path selection, ResourceLoader calls, permits and adoption decisions; prototype
-  cache state owns shared missing outcomes.
+  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.
 - `M2MeshResourceCacheState` owns prepared static Mesh references and releases
   them at the existing final-shutdown site. Prototype state and materialization
   belong to the sibling cache service and loader respectively.
 - `M2MeshResourceExtractor` owns depth-first first-Mesh selection and temporary
-  PackedScene instance destruction. The loader retains ResourceLoader I/O,
-  cache/missing adoption and materialization.
+  PackedScene instance destruction. The static observer admits ResourceLoader
+  requests and initial cache/missing adoption; the loader retains polling,
+  terminal adoption and 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.
@@ -579,6 +583,7 @@ 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 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 |
@@ -652,6 +657,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/render/m2/m2_static_batch_materializer.gd` | Static MultiMesh construction, render setup and attachment |
 | `src/render/m2/m2_build_dispatch_planner.gd` | M2 wait/materializer/advance action priority and transition plan |
 | `src/render/m2/m2_build_resource_snapshot.gd` | Typed per-step animated/static observations and borrowed references |
+| `src/render/m2/m2_static_build_resource_observer.gd` | Static Mesh lookup/request/missing snapshot production |
 | `src/render/m2/m2_build_job.gd` | M2 root/groups references and group/offset/serial progress |
 | `src/render/m2/m2_build_queue.gd` | Keyed pending jobs and FIFO/stale tile-key lifecycle |
 | `src/render/m2/m2_mesh_load_pipeline_state.gd` | Static M2 pending Resource paths, terminal statuses and finalize FIFO |
@@ -682,6 +688,7 @@ Exact exported settings and cache versions remain documented in [`../../RENDER.m
 | `src/tools/verify_m2_static_batch_materializer.gd` | Static M2 node/Mesh/render/attachment/boundary/timing regression |
 | `src/tools/verify_m2_build_dispatch_planner.gd` | M2 dispatch priority/action/transition/boundary/timing regression |
 | `src/tools/verify_m2_build_resource_snapshot.gd` | M2 observation identity/adoption/lifetime/boundary/timing regression |
+| `src/tools/verify_m2_static_build_resource_observer.gd` | Static lookup/request/path/boundary/timing regression |
 | `src/tools/verify_m2_build_queue.gd` | M2 job/FIFO/progress/lifetime/boundary/timing regression |
 | `src/tools/verify_m2_mesh_load_pipeline_state.gd` | Static M2 request/terminal/FIFO/boundary/timing regression |
 | `src/tools/verify_m2_mesh_resource_cache_state.gd` | Static M2 Mesh cache ownership/lifetime/boundary/timing regression |

src/render/m2/m2_static_build_resource_observer.gd

@@ -0,0 +1,126 @@
+class_name M2StaticBuildResourceObserver
+extends RefCounted
+
+## Resolves or requests one static M2 build Mesh and fills a resource snapshot.
+
+const OUTCOME_REJECTED := &"rejected"
+const OUTCOME_CACHED := &"cached"
+const OUTCOME_PENDING := &"pending"
+const OUTCOME_REQUESTED := &"requested"
+const OUTCOME_MISSING := &"missing"
+
+
+## Observes cache/request state and adopts the exact static result into snapshot.
+func observe(
+	resource_snapshot: RefCounted,
+	normalized_relative_path: String,
+	cache_directory: String,
+	mesh_cache_state: RefCounted,
+	prototype_cache_state: RefCounted,
+	load_pipeline_state: RefCounted
+) -> StringName:
+	if (
+		resource_snapshot == null
+		or normalized_relative_path.is_empty()
+		or mesh_cache_state == null
+		or prototype_cache_state == null
+		or load_pipeline_state == null
+	):
+		return OUTCOME_REJECTED
+	if bool(mesh_cache_state.call("has_mesh", normalized_relative_path)):
+		resource_snapshot.call(
+			"adopt_static_observation",
+			mesh_cache_state.call("find_mesh", normalized_relative_path) as Mesh,
+			false
+		)
+		return OUTCOME_CACHED
+	if bool(prototype_cache_state.call("is_model_missing", normalized_relative_path)):
+		resource_snapshot.call("adopt_static_observation", null, true)
+		return OUTCOME_MISSING
+	if bool(load_pipeline_state.call("has_request", normalized_relative_path)):
+		resource_snapshot.call("adopt_static_observation", null, false)
+		return OUTCOME_PENDING
+
+	for cache_resource_path in cache_resource_paths(
+		cache_directory,
+		normalized_relative_path,
+		[".tscn", ".glb"]
+	):
+		if not ResourceLoader.exists(cache_resource_path):
+			continue
+		if (
+			cache_resource_path.get_extension().to_lower() == "glb"
+			and glb_animation_schema(cache_resource_path) == "pivot_prefix_v1"
+		):
+			continue
+		var request_error := ResourceLoader.load_threaded_request(
+			cache_resource_path,
+			"",
+			false,
+			ResourceLoader.CACHE_MODE_REUSE
+		)
+		if request_error == OK or request_error == ERR_BUSY:
+			load_pipeline_state.call(
+				"remember_request",
+				normalized_relative_path,
+				cache_resource_path
+			)
+			resource_snapshot.call("adopt_static_observation", null, false)
+			return OUTCOME_REQUESTED
+		break
+
+	prototype_cache_state.call("mark_model_missing", normalized_relative_path)
+	resource_snapshot.call("adopt_static_observation", null, true)
+	return OUTCOME_MISSING
+
+
+## Returns historical nested/lowercase/basename cache candidates without I/O.
+func cache_resource_paths(
+	cache_directory: String,
+	relative_path: String,
+	extensions: Array[String]
+) -> PackedStringArray:
+	var normalized := relative_path.replace("\\", "/")
+	var lower := normalized.to_lower()
+	var stems := [
+		normalized.get_basename(),
+		lower.get_basename(),
+		normalized.get_file().get_basename(),
+		lower.get_file().get_basename(),
+	]
+	var result := PackedStringArray()
+	for extension in extensions:
+		for stem in stems:
+			if stem.is_empty():
+				continue
+			var path := cache_directory.path_join(stem + extension)
+			if not result.has(path):
+				result.append(path)
+	return result
+
+
+## Reads only the OpenWC animation schema marker from a GLB JSON chunk.
+func glb_animation_schema(cache_resource_path: String) -> String:
+	var absolute_path := ProjectSettings.globalize_path(cache_resource_path)
+	if not FileAccess.file_exists(absolute_path):
+		return ""
+	var file := FileAccess.open(absolute_path, FileAccess.READ)
+	if file == null or file.get_length() < 20:
+		return ""
+	var magic := file.get_32()
+	var version := file.get_32()
+	file.get_32()
+	if magic != 0x46546c67 or version != 2:
+		return ""
+	var json_length := int(file.get_32())
+	var chunk_type := file.get_32()
+	if json_length <= 0 or chunk_type != 0x4e4f534a:
+		return ""
+	var parsed: Variant = JSON.parse_string(
+		file.get_buffer(json_length).get_string_from_utf8()
+	)
+	if not (parsed is Dictionary):
+		return ""
+	var asset: Dictionary = (parsed as Dictionary).get("asset", {})
+	var extras: Dictionary = asset.get("extras", {})
+	return String(extras.get("openwc_m2_anim_schema", ""))

src/render/m2/m2_static_build_resource_observer.gd.uid

@@ -0,0 +1 @@
+uid://c0e3p80ld1dfb

src/scenes/streaming/streaming_world_loader.gd

@@ -70,6 +70,9 @@ const M2_BUILD_QUEUE_SCRIPT := preload("res://src/render/m2/m2_build_queue.gd")
 const M2_STATIC_BATCH_MATERIALIZER_SCRIPT := preload(
 	"res://src/render/m2/m2_static_batch_materializer.gd"
 )
+const M2_STATIC_BUILD_RESOURCE_OBSERVER_SCRIPT := preload(
+	"res://src/render/m2/m2_static_build_resource_observer.gd"
+)
 const M2_RUNTIME_MESH_FINALIZER_SCRIPT := preload(
 	"res://src/render/m2/m2_runtime_mesh_finalizer.gd"
 )
@@ -277,6 +280,9 @@ var _m2_group_result_mutex := Mutex.new()
 var _m2_group_result_queue: Array = []
 var _m2_build_queue_state := M2_BUILD_QUEUE_SCRIPT.new()
 var _m2_build_dispatch_planner := M2_BUILD_DISPATCH_PLANNER_SCRIPT.new()
+var _m2_static_build_resource_observer := (
+	M2_STATIC_BUILD_RESOURCE_OBSERVER_SCRIPT.new()
+)
 var _m2_unique_placement_registry := (
 	M2_UNIQUE_PLACEMENT_REGISTRY_SCRIPT.new()
 )
@@ -4373,14 +4379,13 @@ func _process_m2_build_jobs() -> void:
 				batch_count > 0
 				and not bool(resource_snapshot.call("has_animated_prototype"))
 			):
-				var static_mesh := _get_m2_mesh_or_request(rel_path)
-				resource_snapshot.call(
-					"adopt_static_observation",
-					static_mesh,
-					(
-						static_mesh == null
-						and _m2_prototype_cache_state.is_model_missing(normalized_rel)
-					)
+				_m2_static_build_resource_observer.observe(
+					resource_snapshot,
+					normalized_rel,
+					m2_cache_dir,
+					_m2_mesh_resource_cache_state,
+					_m2_prototype_cache_state,
+					_m2_mesh_load_pipeline_state
 				)
 		var dispatch_plan: Dictionary = _m2_build_dispatch_planner.plan_step(
 			batch_count,
@@ -4587,40 +4592,6 @@ func _normalize_m2_rel_path(rel_path: String) -> String:
 	return normalized_rel
 
 
-func _get_m2_mesh_or_request(rel_path: String) -> Mesh:
-	var normalized_rel := _normalize_m2_rel_path(rel_path)
-	if normalized_rel.is_empty():
-		return null
-	if _m2_mesh_resource_cache_state.has_mesh(normalized_rel):
-		return _m2_mesh_resource_cache_state.find_mesh(normalized_rel)
-	if _m2_prototype_cache_state.is_model_missing(normalized_rel):
-		return null
-	_request_m2_mesh_load(normalized_rel)
-	return null
-
-
-func _request_m2_mesh_load(normalized_rel: String) -> void:
-	if normalized_rel.is_empty() or _m2_mesh_load_pipeline_state.has_request(normalized_rel):
-		return
-
-	for cache_res_path in _get_m2_cache_resource_paths(normalized_rel, [".tscn", ".glb"]):
-		if not ResourceLoader.exists(cache_res_path):
-			continue
-		if cache_res_path.get_extension().to_lower() == "glb" and _glb_cache_animation_schema(cache_res_path) == "pivot_prefix_v1":
-			continue
-		var err := ResourceLoader.load_threaded_request(
-			cache_res_path,
-			"",
-			false,
-			ResourceLoader.CACHE_MODE_REUSE)
-		if err == OK or err == ERR_BUSY:
-			_m2_mesh_load_pipeline_state.remember_request(normalized_rel, cache_res_path)
-			return
-		break
-
-	_m2_prototype_cache_state.mark_model_missing(normalized_rel)
-
-
 func _prepare_m2_mesh_for_runtime(normalized_rel: String, mesh: Mesh) -> Mesh:
 	if mesh == null:
 		return null
@@ -4820,7 +4791,12 @@ func _get_or_load_m2_prototype(rel_path: String) -> Node3D:
 	for cache_res_path in _get_m2_cache_resource_paths(normalized_rel, [".tscn", ".glb"]):
 		if not ResourceLoader.exists(cache_res_path):
 			continue
-		if cache_res_path.get_extension().to_lower() == "glb" and _glb_cache_animation_schema(cache_res_path) == "pivot_prefix_v1":
+		if (
+			cache_res_path.get_extension().to_lower() == "glb"
+			and _m2_static_build_resource_observer.glb_animation_schema(
+				cache_res_path
+			) == "pivot_prefix_v1"
+		):
 			continue
 		var resource: Resource = load(cache_res_path)
 		if resource is PackedScene:
@@ -5041,28 +5017,6 @@ func _glb_primitive_count(gltf: Dictionary) -> int:
 	return count
 
 
-func _glb_cache_animation_schema(cache_res_path: String) -> String:
-	var abs_path := ProjectSettings.globalize_path(cache_res_path)
-	if not FileAccess.file_exists(abs_path):
-		return ""
-	var file := FileAccess.open(abs_path, FileAccess.READ)
-	if file == null or file.get_length() < 20:
-		return ""
-	var magic := file.get_32()
-	var version := file.get_32()
-	file.get_32()
-	if magic != 0x46546c67 or version != 2:
-		return ""
-	var json_len := int(file.get_32())
-	var chunk_type := file.get_32()
-	if json_len <= 0 or chunk_type != 0x4e4f534a:
-		return ""
-	var parsed = JSON.parse_string(file.get_buffer(json_len).get_string_from_utf8())
-	if parsed is Dictionary:
-		return _glb_animation_schema(parsed as Dictionary)
-	return ""
-
-
 func _glb_animation_schema(gltf: Dictionary) -> String:
 	var asset: Dictionary = gltf.get("asset", {})
 	var extras: Dictionary = asset.get("extras", {})

src/tools/verify_m2_build_dispatch_planner.gd

@@ -160,7 +160,7 @@ func _verify_loader_and_dependency_boundaries(failures: Array[String]) -> void:
 		failures
 	)
 	_expect_true(
-		loader_source.contains("_get_m2_mesh_or_request(rel_path)")
+		loader_source.contains("_m2_static_build_resource_observer.observe(")
 		and loader_source.contains("_materialize_m2_animated_batch(")
 		and loader_source.contains("_materialize_m2_group_batch(")
 		and loader_source.contains("try_consume_permit("),

src/tools/verify_m2_build_resource_snapshot.gd

@@ -8,6 +8,7 @@ const SNAPSHOT_SCRIPT := preload(
 )
 const SNAPSHOT_PATH := "res://src/render/m2/m2_build_resource_snapshot.gd"
 const DISPATCH_PATH := "res://src/render/m2/m2_build_dispatch_planner.gd"
+const STATIC_OBSERVER_PATH := "res://src/render/m2/m2_static_build_resource_observer.gd"
 const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
 
 
@@ -134,10 +135,10 @@ func _verify_engine_lifetime(failures: Array[String]) -> void:
 func _verify_loader_and_dependency_boundaries(failures: Array[String]) -> void:
 	var loader_source := FileAccess.get_file_as_string(LOADER_PATH)
 	var dispatch_source := FileAccess.get_file_as_string(DISPATCH_PATH)
+	var static_observer_source := FileAccess.get_file_as_string(STATIC_OBSERVER_PATH)
 	var snapshot_source := FileAccess.get_file_as_string(SNAPSHOT_PATH)
 	for delegated_token in [
 		"M2_BUILD_RESOURCE_SNAPSHOT_SCRIPT.new(",
-		"\"adopt_static_observation\"",
 		"resource_snapshot.call(\"animated_prototype\")",
 		"resource_snapshot.call(\"static_mesh\")",
 	]:
@@ -146,6 +147,11 @@ func _verify_loader_and_dependency_boundaries(failures: Array[String]) -> void:
 			"loader uses %s" % delegated_token,
 			failures
 		)
+	_expect_true(
+		static_observer_source.contains("\"adopt_static_observation\""),
+		"static observer adopts snapshot",
+		failures
+	)
 	_expect_true(
 		dispatch_source.contains("resource_snapshot.call(\"animation_request_pending\")")
 		and dispatch_source.contains("resource_snapshot.call(\"has_static_mesh\")"),

src/tools/verify_m2_mesh_resource_cache_state.gd

@@ -6,6 +6,7 @@ extends SceneTree
 const CACHE_SCRIPT := preload("res://src/render/m2/m2_mesh_resource_cache_state.gd")
 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"
 
 
 func _initialize() -> void:
@@ -68,6 +69,7 @@ func _verify_clear_and_diagnostics(failures: Array[String]) -> void:
 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)
 	_expect_true(
 		loader_source.contains("M2_MESH_RESOURCE_CACHE_STATE_SCRIPT.new()"),
 		"loader composes Mesh cache state",
@@ -81,7 +83,8 @@ func _verify_ownership_boundaries(failures: Array[String]) -> void:
 		failures
 	)
 	_expect_equal(
-		loader_source.count("_m2_mesh_resource_cache_state.find_mesh("),
+		loader_source.count("_m2_mesh_resource_cache_state.find_mesh(")
+		+ observer_source.count("\"find_mesh\""),
 		2,
 		"two existing lookups delegate",
 		failures

src/tools/verify_m2_static_build_resource_observer.gd

@@ -0,0 +1,127 @@
+extends SceneTree
+
+const OBSERVER_SCRIPT := preload("res://src/render/m2/m2_static_build_resource_observer.gd")
+const SNAPSHOT_SCRIPT := preload("res://src/render/m2/m2_build_resource_snapshot.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 PIPELINE_SCRIPT := preload("res://src/render/m2/m2_mesh_load_pipeline_state.gd")
+const OBSERVER_PATH := "res://src/render/m2/m2_static_build_resource_observer.gd"
+const LOADER_PATH := "res://src/scenes/streaming/streaming_world_loader.gd"
+
+
+func _initialize() -> void:
+	var failures: Array[String] = []
+	_verify_invalid_cached_missing_pending(failures)
+	_verify_request_and_path_order(failures)
+	_verify_source_boundaries(failures)
+	var elapsed := _verify_timing(failures)
+	if not failures.is_empty():
+		for failure in failures:
+			push_error("M2_STATIC_BUILD_RESOURCE_OBSERVER: %s" % failure)
+		quit(1)
+		return
+	print("M2_STATIC_BUILD_RESOURCE_OBSERVER PASS cases=11 iterations=20000 elapsed_ms=%.3f" % elapsed)
+	quit(0)
+
+
+func _verify_invalid_cached_missing_pending(failures: Array[String]) -> void:
+	var observer: RefCounted = OBSERVER_SCRIPT.new()
+	var mesh_cache: RefCounted = MESH_CACHE_SCRIPT.new()
+	var prototype_cache: RefCounted = PROTOTYPE_CACHE_SCRIPT.new()
+	var pipeline: RefCounted = PIPELINE_SCRIPT.new()
+	var snapshot: RefCounted = SNAPSHOT_SCRIPT.new("world/a.m2", null, false)
+	_expect(
+		observer.call(
+			"observe", null, "world/a.m2", "res://none",
+			mesh_cache, prototype_cache, pipeline
+		)
+		== OBSERVER_SCRIPT.OUTCOME_REJECTED,
+		"null snapshot rejected", failures
+	)
+	var mesh := ArrayMesh.new()
+	mesh_cache.call("store_mesh", "world/a.m2", mesh)
+	_expect(
+		observer.call(
+			"observe", snapshot, "world/a.m2", "res://none",
+			mesh_cache, prototype_cache, pipeline
+		)
+		== OBSERVER_SCRIPT.OUTCOME_CACHED, "cached outcome", failures
+	)
+	_expect(is_same(snapshot.call("static_mesh"), mesh), "cached Mesh identity", failures)
+	mesh_cache.call("clear")
+	prototype_cache.call("mark_model_missing", "world/a.m2")
+	_expect(
+		observer.call(
+			"observe", snapshot, "world/a.m2", "res://none",
+			mesh_cache, prototype_cache, pipeline
+		)
+		== OBSERVER_SCRIPT.OUTCOME_MISSING, "missing outcome", failures
+	)
+	_expect(bool(snapshot.call("static_model_missing")), "missing adopted", failures)
+	prototype_cache = PROTOTYPE_CACHE_SCRIPT.new()
+	pipeline.call("remember_request", "world/a.m2", "res://pending.tscn")
+	_expect(
+		observer.call(
+			"observe", snapshot, "world/a.m2", "res://none",
+			mesh_cache, prototype_cache, pipeline
+		)
+		== OBSERVER_SCRIPT.OUTCOME_PENDING, "pending outcome", failures
+	)
+	_expect(not bool(snapshot.call("static_model_missing")), "pending is not missing", failures)
+	pipeline.call("clear")
+	prototype_cache.call("clear_and_release")
+
+
+func _verify_request_and_path_order(failures: Array[String]) -> void:
+	var observer: RefCounted = OBSERVER_SCRIPT.new()
+	var extensions: Array[String] = [".tscn", ".glb"]
+	var paths: PackedStringArray = observer.call(
+		"cache_resource_paths", "res://cache", "World/Foo/Bar.M2", extensions
+	)
+	var expected := PackedStringArray([
+		"res://cache/World/Foo/Bar.tscn", "res://cache/world/foo/bar.tscn",
+		"res://cache/Bar.tscn", "res://cache/bar.tscn",
+		"res://cache/World/Foo/Bar.glb", "res://cache/world/foo/bar.glb",
+		"res://cache/Bar.glb", "res://cache/bar.glb",
+	])
+	_expect(paths == expected, "candidate order", failures)
+	_expect(
+		observer.call("glb_animation_schema", "res://missing.glb") == "",
+		"missing GLB schema empty", failures
+	)
+
+
+func _verify_source_boundaries(failures: Array[String]) -> void:
+	var loader := FileAccess.get_file_as_string(LOADER_PATH)
+	var observer := FileAccess.get_file_as_string(OBSERVER_PATH)
+	_expect(
+		loader.contains("_m2_static_build_resource_observer.observe("),
+		"loader delegates observer", failures
+	)
+	_expect(not loader.contains("func _get_m2_mesh_or_request"), "legacy lookup removed", failures)
+	_expect(not loader.contains("func _request_m2_mesh_load"), "legacy request removed", failures)
+	_expect(
+		observer.contains("ResourceLoader.load_threaded_request("),
+		"observer owns request", failures
+	)
+	for forbidden in ["queue_free", "RenderingServer", "WorkerThreadPool", "Mutex"]:
+		_expect(not observer.contains(forbidden), "observer omits %s" % forbidden, failures)
+
+
+func _verify_timing(failures: Array[String]) -> float:
+	var observer: RefCounted = OBSERVER_SCRIPT.new()
+	var extensions: Array[String] = [".tscn", ".glb"]
+	var started := Time.get_ticks_usec()
+	for index in range(20000):
+		observer.call(
+			"cache_resource_paths", "res://cache",
+			"world/%d/model.m2" % (index % 64), extensions
+		)
+	var elapsed := float(Time.get_ticks_usec() - started) / 1000.0
+	_expect(elapsed < 1000.0, "path planning bounded", failures)
+	return elapsed
+
+
+func _expect(condition: bool, label: String, failures: Array[String]) -> void:
+	if not condition:
+		failures.append(label)

src/tools/verify_m2_static_build_resource_observer.gd.uid

@@ -0,0 +1 @@
+uid://b8bxs4swxsntd

targets/03-renderer-facade.md

@@ -58,7 +58,8 @@ Runtime и Editor используют facade; planner/scheduler тестиру
   `M03-RND-M2-STATIC-BATCH-MATERIALIZER-001`,
   `M03-RND-M2-BUILD-QUEUE-001`,
   `M03-RND-M2-BUILD-DISPATCH-PLANNER-001`,
-  `M03-RND-M2-BUILD-RESOURCE-SNAPSHOT-001`
+  `M03-RND-M2-BUILD-RESOURCE-SNAPSHOT-001`,
+  `M03-RND-M2-STATIC-BUILD-RESOURCE-OBSERVER-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
@@ -275,6 +276,10 @@ Runtime и Editor используют facade; planner/scheduler тестиру
   materializers, animation/Mesh pipelines, Mesh/prototype state, shutdown, facade,
   internal-access `30`, manifest and checkpoint dry-run `7/7`, documentation and
   coordination remained green.
+  M2 static build resource observer passed `cases=11 iterations=20000
+  elapsed_ms=64.158` with invalid/cached/Mesh-identity/missing/pending outcomes,
+  exact candidate order, GLB schema fallback and source ownership. All 55
+  autonomous headless regressions passed; internal-access remains `30`.
   M02 terrain-query regression
   remained green (13 pre-existing expired M00 claim warnings).
 - Fidelity comparison: all 16 historical operation limits and drain sites were
@@ -429,6 +434,7 @@ Runtime и Editor используют facade; planner/scheduler тестиру
   typed M2 build job/queue and loader enqueue/drain/progress/cancel/clear adapters,
   stateless M2 build dispatch planner and loader resource-observation/action adapter,
   typed M2 build resource snapshot and loader/dispatch/materializer adapters,
+  static M2 build resource observer and loader/cache/pipeline/snapshot adapters,
   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
@@ -455,6 +461,8 @@ Runtime и Editor используют facade; planner/scheduler тестиру
   separated and dispatch decisions are explicit, while resource observation/
   requests, action execution and root cleanup remain in loader; resource state is
   typed per operation but its producing service is not yet extracted;
+  static lookup/request production is extracted, while animated observation and
+  both ResourceLoader finalize drains 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;