Capture the reversal of V56's no-FK decision, the DB-layer-integrity
principle, and the cascade-boundary invariant (the cascade never reaches
documents rows). Numbered 032 — 028-031 are already taken on main; the
issue's '028 is next' was written before main moved.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
