Capture M16 gap execution artifacts

docs/status/M16-GAP-00143.md

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+# M16-GAP-00143 Status
+
+status: done
+task: action.snap operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope:
+
+- Action Editor current-frame snapping on `object:WebGapSnapObject`, using `type=CFRA` at frame 4.
+
+evidence:
+
+- Blender desktop and WASM/Main expose matching location channels with keyframes `[1,4,5]` and frame 4 selected.
+- Save/reopen is exact; malformed Blend input is rejected without Main mutation.
+- Fixture generation, desktop checker, npm comparator, direct comparator, context handoff and manifest hashing passed.
+
+nextTask: `M16-GAP-00144`