Migrate semantics-preserving gate changes

Type: kb/types/instruction.md

Use this instruction only when the gate meaning stays the same. If the gate semantics change, run fresh reviews instead.

Steps

1. Edit the target gate files.
2. Update the stored accepted review text to match the new gate wording. Keep the canonical stored decision aligned.
3. For each affected current acceptance, append a new acceptance event with:
4. acceptance_kind = gate-migration
5. the same accepted_review_id
6. the same accepted_note_sha
7. the same accepted_note_commit
8. the same model_id
9. the new accepted_gate_sha
10. Do not advance the accepted note baseline during this migration.
11. Verify the affected pairs no longer appear as gate-changed.