ADR-0087 exemption (no-migration-prescription): A runtime route retirement in RestServer.registerOpenApiEndpoints, not a metadata change. No spec key, export, option, config field, response field or stored shape is removed, renamed or re-shaped: the page was an HTML answer on one REST path, and `objectstack migrate meta` has nothing to rewrite. The machine-readable document, its `api.enableOpenApi` gate and its answer are unchanged. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id covers this route and this diff adds none (not registered / already-registered); and no published interface or type changes (not runtime-interface-only / type-surface-only / runtime-export-retired).