Continue Blender Web parity task handoff

docs/status/M16-GAP-00236.md

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+# M16-GAP-00236 Status
+
+status: done
+task: armature.duplicate operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal fixture contains one selected source bone with both endpoints selected and one independent unselected bone.
+- Desktop runs `ARMATURE_OT_duplicate` in edit mode with `poll=true` and `FINISHED`, creating `WebGapArmatureDuplicateSource.001`, selecting it and making it active while preserving the source and independent bone through save/reopen.
+- Main already exposes armature bone names, parent IDs, selection state, and head/tail coordinates, so the same duplicated fixture is observable in WASM/Main without expanding other data-blocks, editors, or browsers.
+
+evidence:
+
+- The generator, desktop checker, npm comparator, direct comparator, malformed-input negative, save/reopen check, and task-context checks passed.
+- WASM/Main observes the duplicate with desktop-matching geometry and selection, rejects malformed Blend input without Main mutation, and remains stable across save/reopen.
+- Repeated checker runs recognize the already-duplicated state and remain idempotent; Chromium-only policy was preserved and no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00237`