Complete M16 action select circle parity

docs/status/M16-GAP-00120.md

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+# M16-GAP-00120 Status
+
+status: done
+task: action.easing_type operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor easing-type operation on `object:WebGapEasingTypeObject`.
+
+evidence:
+
+- Blender generator selects frame 3 and executes `bpy.ops.action.easing_type(type="EASE_IN_OUT")`; all three location curves report `AUTO, EASE_IN_OUT, AUTO`.
+- WASM/Main now exports keyframe easing metadata and matches desktop; save/reopen is exact.
+- Malformed Blend input is rejected without mutating Main.
+- Generator, desktop checker, WASM rebuild, npm comparator, direct comparator, context handoff, and governance exited 0.
+
+knownRisk: This slice covers EASE_IN_OUT on one selected frame; other easing modes and editor contexts remain separate operator tasks.
+
+nextTask: `M16-GAP-00121`