ADR-0087 exemption (no-migration-prescription): No metadata moves: `sys_comment` keeps both fields with their names and types, no spec key, authorable spelling, export or stored shape is added, removed, renamed or re-shaped, and a row stored before this change keeps its bytes, so there is nothing for `objectstack migrate meta` to rewrite. What narrows is one runtime write door: a client's value for two platform-written fields no longer lands, and a predicate body update whose matched rows disagree is refused; the remedy is in the request a caller sends to that door, never a rewrite of a package source or a stored row. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered); and no exported declaration is removed or narrowed (not runtime-interface-only, type-surface-only or runtime-export-retired).