Complete M16 action select circle parity

docs/status/M16-GAP-00129.md

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+# M16-GAP-00129 Status
+
+status: done
+task: action.new operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor new-action operation on `object:WebGapActionNewObject`.
+
+evidence:
+
+- Blender executes `bpy.ops.action.new` and creates/assigns `WebGapActionNewObjectAction.001` while preserving the prior Action for stash semantics.
+- Desktop and WASM/Main expose the new Action with three channels; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main animation data.
+- Generator, rebuilt WASM, desktop checker, npm comparator, direct comparator, context handoff, and governance exit 0.
+
+knownRisk: Background execution requires explicit harness assignment of the newly created Action because the UI template pointer is unavailable; the operator-created datablock and resulting assigned state are still hash-bound.
+
+nextTask: `M16-GAP-00130`