rnd(M03): claim renderer facade seam

Work-Package: M03-RND-FACADE-001
Agent: sindo-main-codex
Tests: not run (coordination-only commit)
Fidelity: no runtime change

coordination/claims/M03-RND-FACADE-001.md

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+# M03-RND-FACADE-001 — Renderer facade first seam
+
+<!-- OPENWC_CLAIM:M03-RND-FACADE-001:sindo-main-codex:2026-07-17 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-renderer-facade`
+- Lease expires UTC: 2026-07-17
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Introduce `WorldRenderFacade` as the only runtime/tool caller surface for typed
+streaming focus updates and read-only renderer metrics, while retaining
+`StreamingWorldLoader` as the unchanged internal implementation.
+
+## Non-goals
+
+- Extract the pure target planner or budget scheduler in this package.
+- Add environment or entity-presentation commands before their contracts exist.
+- Replace the M02 `TerrainQuery` gameplay boundary in this package.
+- Change streaming radii, queues, cache formats, visuals or quality presets.
+- Mark M03 complete or edit its checklist/Evidence.
+
+## Paths
+
+- Exclusive: `src/render/world_render_facade.gd`,
+  `src/tools/verify_world_render_facade.gd`, this claim
+- Shared/hotspots: both runtime streaming scenes, three renderer capture/probe
+  tools, `src/tools/verify_streaming_focus.gd`, `docs/modules/world-renderer.md`,
+  `docs/modules/README.md`, `RENDER.md`
+- Generated/ignored: local `.godot`, native build outputs, caches and proprietary
+  renderer corpus
+
+## Contracts and data
+
+- Public API: `set_streaming_focus`, `refresh_streaming_focus`,
+  `renderer_metrics_snapshot`
+- Scene adapter: explicit `streaming_focus_source_path` owned by the facade
+- Internal implementation seam: `streaming_world_loader_path`; callers must not
+  read streamer queues or call its methods directly
+- Schema/cache/coordinate contracts: unchanged
+- Consumers: runtime scenes, capture tool and renderer probes
+
+## Dependencies
+
+- Requires: M01 `StreamingFocus` and merged M02 closeout on master `4f566b1`
+- Blocks: environment/entity/ground facade contracts and planner extraction
+- External state: none; contract verification uses a test double
+
+## Verification
+
+- Commands: dedicated facade verifier, streaming-focus regression, renderer
+  baseline manifest/dry-run, coordinate boundary and repository gates
+- Fixtures: typed focus, source Node3D and read-only metrics test double
+- Fidelity evidence: no renderer configuration, planner, queue, placement,
+  visibility, material, animation or cache behavior changes
+- Performance budget: one source position sample per process frame; target
+  recomputation remains throttled inside the existing streamer
+
+## Documentation deliverables
+
+- Inline public API docs for facade properties and methods
+- Updated world-renderer module specification
+- Updated data-flow, sequence and dependency diagrams
+- Updated source map/status and renderer notes
+
+## Simplicity and naming
+
+- Important names: `WorldRenderFacade`, `renderer_metrics_snapshot`
+- Simplest approach: one small Node adapter delegating to the existing streamer
+- Rejected complexity: service container, generic command bus, streamer rewrite
+  or duplicate queue/cache state
+- Unavoidable complexity: scene-relative source and implementation paths are
+  resolved on the main thread with explicit diagnostics
+- Measured optimization evidence: not applicable; behavior-preserving seam
+
+## Status
+
+- State: active
+- Done: worktree and bounded claim created
+- Next: implement facade, migrate runtime/tool consumers, document and verify
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: