Continue Blender Web parity task handoff

docs/status/M16-GAP-00261.md

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+# M16-GAP-00261 Status
+
+status: done
+task: armature.subdivide operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The fixture contains one selected length-1 bone and one unrelated unselected
+  bone. Blender desktop runs `ARMATURE_OT_subdivide(number_cuts=1)`, producing
+  two half-length pieces and preserving the result through save/reopen.
+- WASM/Main reads the same armature. The comparator confirms the two-piece
+  geometry, unrelated selection, malformed-input rejection, and save/reopen.
+
+evidence:
+
+- Fixture generation, desktop checker, npm comparator, and direct comparator
+  passed. Chromium-only policy was preserved and no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00262`