Complete M16 action select circle parity

docs/status/M16-GAP-00135.md

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+# M16-GAP-00135 Status
+
+status: done
+task: action.select_by_type operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor keyframe-type selection on `object:WebGapSelectByTypeObject`.
+
+evidence:
+
+- Blender marks frame 3 as BREAKDOWN, clears selection, and executes `bpy.ops.action.select_by_type(type="BREAKDOWN", extend=False)`.
+- Desktop and WASM/Main expose matching keyframe types 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 BREAKDOWN selection; other keyframe types and extend behavior remain separate cases.
+
+nextTask: `M16-GAP-00136`