ADR-0087 exemption (no-migration-prescription): a refusal at the page save door of a page component visibleWhen that the published validator already refuses at `os build`: no authorable key, spelling, export or stored shape moves, and no stored row is read, rewritten or converted. A stored page whose component predicate the validator refuses keeps loading until it is next saved, and the repair is the author's edit of the predicate, which no ledger entry can derive. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id covers this door (not already-registered); and the change is a door verdict, not a declaration or an export (not runtime-interface-only, type-surface-only or runtime-export-retired).