Capture M16 gap execution artifacts

docs/status/M16-GAP-00161.md

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+# M16-GAP-00161 Status
+
+status: done
+task: anim.channels_group operator LOCAL_EXACT slice
+updated: 2026-08-21 America/New_York
+
+scope:
+
+- Action Editor `anim.channels_group` assigns the three selected location F-Curves to `WebGapTransforms`.
+
+evidence:
+
+- Blender desktop and WASM/Main expose all three channels with the exact `WebGapTransforms` group.
+- Save/reopen is exact; malformed Blend input is rejected without Main mutation.
+- Fixture generation, desktop checker, npm comparator, direct comparator, context governance, and artifact hashing passed.
+
+nextTask: `M16-GAP-00162`