ADR-0087 exemption (no-migration-prescription): No authorable surface is removed or renamed — no spec key, no export, no config field changes spelling, so `objectstack migrate meta` has nothing to rewrite and no ledger entry could serve an upgrader. The newly-refused call shape was a self-contradictory input whose declared condition was never evaluated; deciding which of the two ids the caller meant is a per-site intent decision a mechanical rewrite must not make, and the refusal text itself names both call-site fixes.