ADR-0087 exemption (no-migration-prescription): No metadata moves: no spec key, authorable spelling, object definition, stored row or stored shape is added, removed, renamed or re-shaped. `ScreenFieldConfigSchema.type` stays an open string, so every flow that parsed before still parses, and nothing exported is removed or narrowed. What changes is what a screen field already declared `type: 'file'` means: the console renders the upload widget for it, and the resume door refuses a value that is not a file id. The remedy is a change in what a caller posts to `resume` (the uploaded file's id), never a rewrite of a package source or a stored row, so there is nothing for `objectstack migrate meta` to rewrite. The other categories are closed on facts: the three packages publish (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered); and no runtime interface, type or export is removed or narrowed (not runtime-interface-only, type-surface-only or runtime-export-retired).