coordination: claim WMO render group materializer

Work-Package: M03-RND-WMO-RENDER-GROUP-MATERIALIZER-001
Agent: sindo-main-codex
Tests: not run (coordination only)
Fidelity: behavior-preserving extraction planned

coordination/claims/M03-RND-WMO-RENDER-GROUP-MATERIALIZER-001.md

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+# M03-RND-WMO-RENDER-GROUP-MATERIALIZER-001
+
+<!-- OPENWC_CLAIM:M03-RND-WMO-RENDER-GROUP-MATERIALIZER-001:sindo-main-codex:2026-08-03 -->
+
+## Owner
+
+- Agent ID: `sindo-main-codex`
+- Target: M03 Renderer Facade and Safe Extraction
+- Branch: `work/sindo-main-codex/m03-wmo-render-group-materializer`
+- Worktree: `C:\Users\sindo\open-wc-worktrees\m03-wmo-render-group-materializer`
+
+## Outcome
+
+Move one-step WMO MeshInstance3D and MultiMeshInstance3D creation, render
+settings and attachment from the loader into one main-thread materializer.
+
+## Non-goals
+
+- Change WMO placement, resource loading, build-step planning or queue state.
+- Change runtime Mesh finalization, WMOBuilder material behavior or cache formats.
+- Change permits, visibility distances, shadow policy or visible output.
+- Generalize M2 and WMO materialization behind a shared abstraction.
+
+## Paths
+
+- Exclusive: `src/render/wmo/wmo_render_group_materializer.gd`,
+  `src/tools/verify_wmo_render_group_materializer.gd`,
+  `docs/modules/wmo-render-group-materializer.md`, this claim
+- Shared: loader, renderer module registry/specification, `RENDER.md`, M03 Evidence
+
+## Contracts and data
+
+- Mesh and MultiMesh resources retain exact identity.
+- Names and optional transforms preserve existing indexed fallback behavior.
+- Shadow and positive visibility-range settings are applied unchanged.
+- The supplied WMO root becomes the sole SceneTree owner of the created node.
+- Editor persisted ownership is assigned only when an explicit owner is supplied.
+
+## Dependencies
+
+- Requires: accepted WMO render build queue/planner and runtime Mesh finalizer
+- Blocks: remaining loader-owned WMO runtime traversal cleanup
+
+## Verification
+
+- Synthetic Mesh/MultiMesh identity, naming, transform, rendering, attachment,
+  invalid-input, ownership, source and bounded-timing contracts; adjacent WMO and
+  renderer gates; full autonomous suite and checkpoint dry-run.
+
+## Documentation deliverables
+
+- Inline API docs; module API/I/O/ownership; data-flow/sequence/dependency
+  diagrams; adjacent renderer docs and M03 Evidence.
+
+## Status
+
+- State: active
+- Done: scope and contracts identified
+- Next: implement and verify materializer delegation
+- Blocked by: