ADR-0087 exemption (no-migration-prescription): Nothing authorable is removed, renamed or reshaped: no spec key, no export, no stored row. `objectstack migrate meta` has nothing to reach, because there is no old spelling that maps to a new one — a caller supplies an id the declaration already required, and an id's repair changes the package's identity, so no mechanical mapping could be prescribed even in principle. The refusal itself carries the remedy.