ADR-0087 exemption (no-migration-prescription): a change of which display field the public lookup picker (`GET /forms/:slug/lookup/:field`) searches and sorts by: the first display field the caller may query, by the security service's answer, where it used to be the first display field. No authorable key, spelling, export or stored shape moves: `@objectstack/rest` exports nothing new and nothing less, `FormFieldPublicPickerSchema` keeps parsing every value it parsed, and no stored row is read or rewritten. A picker's `displayFields` keep their meaning as the projected fields. The other categories are closed on facts: the package publishes (not `unpublished`); no ADR-0087 id covers which field a picker keys on (not `already-registered`); and the change is route behaviour, not a declaration (not `runtime-interface-only` / `type-surface-only`).