refactor(M03): extract WMO scene resource cache state

docs/modules/wmo-render-resource-cache-state.md

@@ -179,8 +179,8 @@ states; Resource references and cache file paths are not exposed. No logs emit.
 
 ## Extension points
 
-- Cached WMO scene request state can use a separate typed module because its
-  size limit, PackedScene validation and missing-file behavior differ.
+- Cached WMO scene request state is a separate typed module because its size
+  limit, PackedScene validation and missing-file behavior differ.
 - A later loader I/O adapter may consume the detached request snapshot while
   preserving this state contract and cache-version boundary.
 
@@ -190,7 +190,7 @@ states; Resource references and cache file paths are not exposed. No logs emit.
 |---|---|---|---|
 | Lightweight WMO render Resource state | Implemented extraction | Lifecycle/source/timing and shutdown verifiers | Asset-backed traversal/leak evidence pending |
 | Cache script/version validation | Preserved in loader | Source boundary and WMO regressions | Dedicated corrupt-cache fixture could follow |
-| Cached WMO scene state | Partial/loader-owned | Existing runtime behavior | Separate extraction |
+| Cached WMO scene state | Implemented extraction | Scene-cache lifecycle/source/timing verifier | Asset-backed traversal/leak evidence pending |
 | WMO materialization | Partial/loader-owned | Queue/planner regressions | Further safe extraction |
 
 ## Known gaps and risks
@@ -213,6 +213,7 @@ states; Resource references and cache file paths are not exposed. No logs emit.
 ## Related decisions and references
 
 - [`wmo-render-build-queue.md`](wmo-render-build-queue.md)
+- [`wmo-scene-resource-cache-state.md`](wmo-scene-resource-cache-state.md)
 - [`wmo-placement-resolver.md`](wmo-placement-resolver.md)
 - [`world-renderer.md`](world-renderer.md)
 - [`../../RENDER.md`](../../RENDER.md)