Complete M16 action select circle parity

docs/status/M16-GAP-00124.md

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+# M16-GAP-00124 Status
+
+status: done
+task: action.interpolation_type operator LOCAL_EXACT slice
+updated: 2026-08-20 America/New_York
+
+scope: Action Editor interpolation-type operation on `object:WebGapInterpolationTypeObject`.
+
+evidence:
+
+- Blender selects frame 3 in all three location channels and executes `bpy.ops.action.interpolation_type(type="LINEAR")`.
+- Desktop and WASM/Main expose `BEZIER, LINEAR, BEZIER` per channel; 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 LINEAR interpolation on selected keys; other interpolation families and operators remain separate tasks.
+
+nextTask: `M16-GAP-00125`