ADR-0087 exemption (no-migration-prescription): no metadata body, authorable key, spelling, export or stored shape moves; what changes is which query shapes the in-process reader contexts accept over the two stored-metadata tables, and the form in which a write's returned row is served, so `objectstack migrate meta` has nothing to rewrite. The other categories are closed on facts: both packages publish (not `unpublished`); no ADR-0087 id covers a refused query shape (not `registered` / `already-registered`); and the change is runtime behaviour, not a declaration (not `runtime-interface-only` / `type-surface-only`).