coord(M03): hand off terrain mesh cache service

coordination/claims/M03-RND-TERRAIN-CACHE-SERVICE-001.md

@@ -83,14 +83,33 @@ source-admission rules from `StreamingWorldLoader` into a small scene-free
 
 ## Status
 
-- State: claimed
-- Done: ownership, behavior and non-goals published
-- Next: implement service, migrate loader wrappers, tests and docs
+- State: ready-for-review
+- Done: scene-free cache ownership/LRU extraction, loader adapter migration,
+  contract regression and module documentation
+- Next: M03 integrator reviews and merges `97480e0`
 - Blocked by:
 
+<!-- OPENWC_HANDOFF:READY:M03-RND-TERRAIN-CACHE-SERVICE-001:97480e0 -->
+
 ## Handoff
 
-- Commit:
-- Results:
-- Remaining risks:
-- Documentation updated:
+- Commit: `97480e0`
+- Results: `TerrainQualityMeshCache` now owns retained full-quality Mesh
+  references, source admission and oldest-to-newest LRU. The loader retains only
+  restore-to-state, store-after-upgrade and clear lifecycle adapters.
+- Verification: cache `contract_cases=15 loader_calls=3`; facade/entity/ground/
+  terrain regressions; internal access `private_symbols=42 gameplay=7
+  editor_sources=9 renderer_tools=1`; manifest `7/7`; shutdown; scheduler
+  `20000` iterations; planner `250` iterations; focus; editor parse; dry-run;
+  coordination, documentation and diff gates passed.
+- Fidelity: `baked_full` revisit retention, three excluded splat sources, LRU
+  touch/trim, profile capacities and all call sites remain unchanged. All seven
+  checkpoint plans remain valid. No visible or build-12340 parity claim is added.
+- External/local inputs: ignored native DLL and generated ADT scripts supported
+  parse/dry-run only; missing proprietary ADT/DBC/character data produced expected diagnostics.
+- Remaining risks: entry count does not measure Mesh bytes; ordered-array touch
+  remains linear; asset-backed revisit flash, memory and p95/p99 evidence remain pending;
+  terrain build/tasks/state/finalization are still monolithic.
+- Documentation updated: new terrain cache API/input-output/data-flow/lifecycle/
+  sequence/ownership/failure/configuration/migration/diagnostic/source-map spec;
+  world renderer, registry and `RENDER.md` updated.