Continue Blender Web parity task handoff

docs/status/M16-GAP-00262.md

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+# M16-GAP-00262 Status
+
+status: done
+task: armature.switch_direction operator LOCAL_EXACT slice
+updated: 2026-08-23 America/New_York
+
+scope:
+
+- The fixture contains a selected connected two-bone chain and an unrelated
+  unselected bone. Blender desktop runs `ARMATURE_OT_switch_direction`,
+  reversing the chain while preserving the result through save/reopen.
+- WASM/Main reads the same armature. The comparator confirms reversed chain
+  geometry and parenting, 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-00263`