Backend: hand-shaped {'error': ...} bodies in app/api get an AST census
and ceiling (1159) — milestone B's migrate-when-touched policy made
enforceable. Frontend: check-frontend-boundaries.mjs gains adoption
ceilings for raw api.* calls in pages (460, E1), per-page toast.error
extraction (264, E1), form-group blocks (343, F2), and unencoded query
interpolations in services/api (97, C4-interim) — totals that may only go
down, with a slack guard so a ceiling cannot drift above reality.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
