coord(M03): claim terrain mesh cache service

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

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+# M03-RND-TERRAIN-CACHE-SERVICE-001 — Terrain quality mesh cache service
+
+<!-- OPENWC_CLAIM:M03-RND-TERRAIN-CACHE-SERVICE-001:sindo-main-codex:2026-07-18 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-terrain-quality-cache`
+- Lease expires UTC: 2026-07-18
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract the full-quality terrain revisit Mesh cache, its LRU ownership and
+source-admission rules from `StreamingWorldLoader` into a small scene-free
+`TerrainQualityMeshCache`, preserving all call sites and observable behavior.
+
+## Non-goals
+
+- Move ADT parsing, tile state, quality-upgrade tasks/results or SceneTree/RID finalization.
+- Change cache capacity defaults, quality profiles, source priority or cache formats.
+- Cache control-splat/splat meshes that the current loader deliberately rejects.
+- Extract chunk LOD, terrain material building, ground query or other asset services.
+- Add dependencies, persistence, background work or mark the terrain service complete.
+
+## Paths
+
+- Exclusive: `src/render/terrain/terrain_quality_mesh_cache.gd`,
+  `src/tools/verify_terrain_quality_mesh_cache.gd`,
+  `docs/modules/terrain-quality-mesh-cache.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.gd`,
+  `src/tools/verify_render_runtime_cache_shutdown.gd`,
+  `docs/modules/world-renderer.md`, `docs/modules/README.md`, `RENDER.md`,
+  `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated resources, caches and
+  proprietary renderer corpus
+
+## Contracts and data
+
+- Public service API: `store`, `restore`, `clear`, detached `diagnostic_snapshot`
+- Entry: tile key, retained Mesh reference and source string
+- Admission: non-empty key, non-null Mesh, source other than
+  `control_splat_cache`, `splat_cache` or `splat`
+- LRU: successful restore touches newest; store touches then trims oldest to
+  `max(0, capacity)`; invalid restored records are removed
+- Persistence/cache format: none; session-memory ownership only
+
+## Dependencies
+
+- Requires: integrated facade contracts master `61bad09`
+- Blocks: later terrain service extraction and cache/finalization acceptance audit
+- External state: none; tests use synthetic ArrayMesh references
+
+## Verification
+
+- Commands: dedicated cache contract/LRU/ownership regression; streamer source
+  boundary; shutdown/facade/internal-access/manifest/planner/scheduler and repository gates
+- Fixtures: admission/rejection, replacement, LRU touch/eviction, zero/negative
+  capacity, invalid record cleanup, clear and detached diagnostics
+- Fidelity evidence: same sources/capacity/call sites; all seven baseline plans unchanged
+- Performance budget: dictionary lookup plus bounded single-entry LRU operations;
+  no Node, task, file, cache serialization or RID creation
+
+## Documentation deliverables
+
+- Inline public API docs: store/restore/clear/diagnostics and ownership
+- Module specification: new terrain quality mesh cache specification
+- Data-flow diagram: upgrade result through cache to revisit state
+- Sequence/state/dependency diagrams: store/restore/evict/reset and failure paths
+- Source map/status updates: module registry, world renderer and `RENDER.md`
+
+## Simplicity and naming
+
+- Important names introduced: `TerrainQualityMeshCache`
+- Simplest considered solution: one RefCounted with dictionary plus ordered tile-key array
+- Rejected complexity/abstractions: generic cache framework, weak references,
+  callbacks, Resource cache integration, background eviction or persistence
+- Unavoidable complexity and justification: Mesh references must survive unloaded
+  tile state while LRU keeps revisit memory bounded
+- Measured optimization evidence: exact ownership extraction, no optimization claim
+
+## Status
+
+- State: claimed
+- Done: ownership, behavior and non-goals published
+- Next: implement service, migrate loader wrappers, tests and docs
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: