Continue Blender Web parity task handoff

docs/status/M16-GAP-00224.md

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+# M16-GAP-00224 Status
+
+status: done
+task: armature.collection_deselect operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal fixture contains two bones in separate bone collections, both initially selected, with the active collection at index 0.
+- Desktop runs `ARMATURE_OT_collection_deselect` with `poll=true` and `FINISHED`, deselecting only the active collection bone while retaining the other selection through save/reopen.
+- Main now exposes the persisted armature bone `selected` bit alongside the existing bone collection membership data; no other data-block, editor, or browser behavior was added.
+
+evidence:
+
+- The generator, desktop checker, npm comparator, direct comparator, Web Engine rebuild, and task-context checks passed. Repeated checker runs recognize the already-deselected fixture and remain idempotent.
+- WASM/Main observes the same selected states, preserves them across save/reopen, and rejects malformed Blend input without Main mutation.
+- Chromium-only policy was preserved; no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00225`