Complete M16 action select circle parity

docs/status/M16-GAP-00133.md

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+# M16-GAP-00133 Status
+
+status: done
+task: action.select_all operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor select-all operation on `object:WebGapSelectAllObject`.
+
+evidence:
+
+- Blender clears selection and executes `bpy.ops.action.select_all(action="SELECT")`; all 9 keyframes become selected.
+- Desktop and WASM/Main expose matching frames and selected flags; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main animation data.
+- Generator, desktop checker, npm comparator, direct comparator, context handoff, and governance exit 0.
+
+knownRisk: This slice covers the SELECT mode; TOGGLE, DESELECT, and INVERT modes remain separate operator cases.
+
+nextTask: `M16-GAP-00134`