coord(M03): claim terrain chunk LOD planner

coordination/claims/M03-RND-TERRAIN-LOD-PLANNER-001.md

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+# M03-RND-TERRAIN-LOD-PLANNER-001 — Pure terrain chunk LOD planner
+
+<!-- OPENWC_CLAIM:M03-RND-TERRAIN-LOD-PLANNER-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-chunk-lod-planner`
+- Lease expires UTC: 2026-07-18
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Extract chunk-level terrain LOD desired-state calculation from the streamer into
+a scene-free `TerrainChunkLodPlanner` with immutable policy and typed focus input.
+
+## Non-goals
+
+- Move chunk/tile queues, loaded state, Mesh/Node/RID creation or budget drains.
+- Change radii, chunk size, threshold inclusivity, priority sorting or tile LOD policy.
+- Normalize/reorder custom radii or reinterpret negative values.
+- Move ADT parsing, quality cache/tasks, materials or ground query.
+- Add dependencies, persistence, workers or mark terrain extraction complete.
+
+## Paths
+
+- Exclusive: `src/render/terrain/terrain_chunk_lod_policy.gd`,
+  `src/render/terrain/terrain_chunk_lod_planner.gd`,
+  `src/tools/verify_terrain_chunk_lod_planner.gd`,
+  `docs/modules/terrain-chunk-lod-planner.md`, this claim
+- Shared/hotspots: `src/scenes/streaming/streaming_world_loader.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
+
+- Input: ADT chunk adapter records, immutable `GodotWorldPosition`, immutable
+  enabled/radii/chunk-size policy
+- Output: detached Dictionary mapping source chunk index to LOD `0`, `1` or `2`
+- Formula: horizontal distance to `origin + half chunk`; inclusive squared thresholds
+- Disabled policy and empty/sparse chunks return absent entries exactly as before
+- Queue/cache/schema/coordinate versions: unchanged
+
+## Dependencies
+
+- Requires: integrated terrain cache slice master `ea08b8e`
+- Blocks: broader terrain service extraction and dependency/performance acceptance
+- External state: none; tests use synthetic chunk adapter records
+
+## Verification
+
+- Commands: dedicated center/boundary/outside/sparse/disabled/custom-radius and
+  bounded timing verifier; loader source boundary; facade/cache/internal-access/
+  manifest/shutdown/scheduler/streaming planner and repository gates
+- Fidelity evidence: extracted formulas and all seven baseline plans remain unchanged
+- Performance budget: bounded linear scan over at most the ADT chunk record count;
+  no Node, Resource, RID, task, cache entry or allocation framework
+
+## Documentation deliverables
+
+- Inline API docs for policy/planner
+- New module spec with inputs/outputs, data-flow, lifecycle, sequence, ownership,
+  failure, performance and source map
+- World renderer/module registry/`RENDER.md` updates
+
+## Simplicity and naming
+
+- Important names: `TerrainChunkLodPolicy`, `TerrainChunkLodPlanner`
+- Simplest solution: immutable scalar policy plus one pure linear planner
+- Rejected complexity: generic spatial index, quadtree, callback strategy,
+  normalized profile model or queue ownership
+- Unavoidable complexity: raw chunk dictionaries remain at the ADT adapter boundary
+- Measured optimization evidence: verifier records bounded High-like planning time
+
+## Status
+
+- State: claimed
+- Done: scope, formulas and ownership published
+- Next: implement policy/planner, migrate one call site, tests and docs
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: