Complete M16 action select circle parity

docs/status/M16-GAP-00127.md

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+# M16-GAP-00127 Status
+
+status: done
+task: action.markers_make_local operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor selected scene-marker localization on `object:WebGapMarkersMakeLocalObject`.
+
+evidence:
+
+- Blender creates and selects `LocalActionMarker` at frame 3, then executes `bpy.ops.action.markers_make_local`; the marker moves into the Action.
+- Reader exposes Action markers; desktop and WASM/Main both read `LocalActionMarker@3`, and 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: This slice covers one selected scene marker; multiple-marker ordering and unselected marker retention remain separate cases.
+
+nextTask: `M16-GAP-00128`