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, and no exported declaration is removed or narrowed, so there is nothing for `objectstack migrate meta` to rewrite. What changes is how the anonymous public-form submit door handles a request body (a value in a declared file field is refused) and which files the file-reference claim path can reach for a write (those within the writing organization's tenant scope). The remedy is a change of how a visitor submits (register and sign in to provide a file), never a rewrite of a package source or a stored row. The other categories are closed on facts: both packages publish (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered); and nothing exported is removed or narrowed (not runtime-interface-only, type-surface-only or runtime-export-retired).