Complete M16 action select circle parity

docs/status/M16-GAP-00132.md

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+# M16-GAP-00132 Status
+
+status: done
+task: action.push_down operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor push-down into NLA on `object:WebGapPushDownObject`.
+
+evidence:
+
+- Blender executes `bpy.ops.action.push_down`; active Action is removed from the active slot and moved to one NLA track with one strip.
+- Desktop and WASM/Main expose the original Action and matching NLA strip/action identity; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main animation/NLA state.
+- Generator, desktop checker, npm comparator, direct comparator, context handoff, and governance exit 0.
+
+knownRisk: This slice covers one push-down operation into an empty NLA stack; existing-track blending remains separate behavior.
+
+nextTask: `M16-GAP-00133`