Capture M16 gap execution artifacts

docs/status/M16-GAP-00146.md

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+# M16-GAP-00146 Status
+
+status: done
+task: action.unlink operator LOCAL_EXACT slice
+updated: 2026-08-21 America/New_York
+
+scope:
+
+- Action Editor unlink on `WebGapActionUnlinkObject`.
+
+evidence:
+
+- Blender desktop reports no active Action while retaining the fake-user `WebGapActionUnlinkObjectAction` with three location channels.
+- WASM/Main exposes the same retained Action as an `animations` record with `unlinked: true` and target `unlinked`.
+- Save/reopen is exact; malformed Blend input is rejected without Main mutation.
+- Reader rebuild, fixture generation, desktop checker, npm comparator, direct comparator and artifact hashing passed.
+
+nextTask: `M16-GAP-00147`