ADR-0087 exemption (no-migration-prescription): Nothing authorable is removed, renamed or re-shaped: no Zod schema, no spec declaration, no stored representation and no published export changes shape, so `objectstack migrate meta` has nothing to rewrite. The change is a runtime refusal inside one driver, reached through a deployment's choice of driver rather than through authored metadata, and it is delivered to the operator by the refusal itself — which names the isolating driver and the ADR-0066 posture in its own message, at the moment the unsupported call is made.