Complete M16 action select circle parity

docs/status/M16-GAP-00125.md

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+# M16-GAP-00125 Status
+
+status: done
+task: action.keyframe_insert operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor keyframe insertion on `object:WebGapKeyframeInsertObject`.
+
+evidence:
+
+- Blender starts with frames 1 and 5, runs `bpy.ops.action.keyframe_insert(type="ALL")` at frame 3, and produces three keys in each location channel.
+- Desktop and WASM/Main expose matching frames, values, and selection 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 `ALL` insertion into existing Action channels; grouped/selected-channel modes remain separate behavior.
+
+nextTask: `M16-GAP-00126`