Continue Blender Web parity task handoff

docs/status/M16-GAP-00260.md

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+# M16-GAP-00260 Status
+
+status: done
+task: armature.split operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The fixture contains a selected root, an unselected connected child, and an
+  unrelated bone. Blender desktop runs `ARMATURE_OT_split`, disconnecting the
+  selected/unselected boundary and preserving the result through save/reopen.
+- WASM/Main reads the same armature. The comparator confirms the disconnected
+  child, malformed-input rejection without Main mutation, 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-00261`