ADR-0087 exemption (no-migration-prescription): Nothing authorable is renamed, retired or re-typed: no `packages/spec` key changes its name, its type or its optionality, no stored shape moves, and every view, form, flow and formula parses byte-identically to before. `objectstack migrate meta` therefore has nothing to rewrite, and this changeset carries no rewrite instructions. What narrows is the ACCEPT SET of published CHECKERS at build time: `validateExpression` and two `@objectstack/lint` rules now report a bare field reference they previously left unjudged, which is the same verdict each of them already returns for that identifier when it is written first in the same predicate. The sources that newly report are already broken at RUN time and were before this change: a bare identifier in a record-scoped site resolves to nothing, the expression evaluates to null and a visibility predicate falls open, which is #1928's class. The remedy is per-source and the diagnostic already names it in full, naming the identifier and the namespace it belongs under; there is no authored artifact and no stored representation for a migration to act on.