Complete M16 action select circle parity

docs/status/M16-GAP-00126.md

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+# M16-GAP-00126 Status
+
+status: done
+task: action.keyframe_type operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor keyframe-type operation on `object:WebGapKeyframeTypeObject`.
+
+evidence:
+
+- Blender selects frame 3 in all three location channels and executes `bpy.ops.action.keyframe_type(type="BREAKDOWN")`.
+- Reader maps `BezTriple.hide` to stable keyframe types; desktop and WASM/Main expose `KEYFRAME, BREAKDOWN, KEYFRAME` per channel.
+- Save/reopen is exact and 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 BREAKDOWN keyframe typing; EXTREME, JITTER, MOVING_HOLD and GENERATED types remain separate operator cases.
+
+nextTask: `M16-GAP-00127`