Continue Blender Web parity task handoff

docs/status/M16-GAP-00206.md

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+# M16-GAP-00206 Status
+
+status: done
+task: anim.slot_channels_move_to_new_action operator LOCAL_EXACT slice
+updated: 2026-08-22 America/New_York
+
+scope:
+
+- The minimal fixture has two objects using separate slots in one action. Desktop selects one Action Slot in the Action Editor and runs `ANIM_OT_slot_channels_move_to_new_action`.
+- The selected slot moves to `WebGapMoveSlotAAction`; the other object remains on the original action. WASM/Main observes both resulting action targets without reader/protocol changes.
+
+evidence:
+
+- Desktop evidence records `poll=true`, `FINISHED`, `SLOT_MOVED_TO_NEW_ACTION`, both action assignments, and exact save/reopen. Repeated checker runs preserve the initial evidence and fixture hash.
+- WASM/Main compares the moved and remaining channels, preserves them across save/reopen, and rejects malformed Blend input without Main mutation.
+- Fixture generation, desktop checker, npm comparator, direct comparator, and task-context checks passed. Chromium-only policy was preserved; no Firefox/WebKit run was made.
+
+nextTask: `M16-GAP-00207`