Capture M16 gap execution artifacts

docs/status/M16-GAP-00165.md

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+# M16-GAP-00165 Status
+
+status: done
+task: anim.channels_select_box operator LOCAL_EXACT slice
+updated: 2026-08-21 America/New_York
+
+scope:
+
+- Action Editor `anim.channels_select_box` selects all three F-Curve channels without selecting keyframes.
+
+evidence:
+
+- Blender desktop and WASM/Main expose the same three `location` channels with `selected: true` and unchanged keyframe selection.
+- The reader reuses the persisted `FCURVE_SELECTED` flag through the optional SceneIR channel field `selected`.
+- Save/reopen preserves the animation snapshot exactly; malformed Blend input is rejected without Main mutation.
+- Fixture generation, desktop checker, npm comparator, direct comparator, context governance, and artifact hashing passed.
+
+nextTask: `M16-GAP-00166`