Root-cause fix for 'correctness depended on post-deploy manual audits'.
Separate psql-driven suite (pnpm test:integration, own vitest config,
integration/ outside __tests__ so the hermetic pnpm test gate is
untouched; self-skips without a DB). 18 tests run against real Postgres:
- 045 class_signup_tx/class_cancel_tx: RETURNS TABLE->array shape the
actions destructure, capacity/waitlist/dedupe, and the per-session
advisory lock under TWO concurrent connections (D11 proven, never
over-enrolls).
- 042 equipment exclusion constraint (overlap 23P01; cancelled/adjacent
ok). 044 self-change trigger (role + payment cols blocked; service
bypass). 043 members_update WITH CHECK (cross-space move blocked).
Disproves the pass-52 flagged risk (signup rpc-shape). Non-runtime;
default pnpm test still 532/26 hermetic; build clean.
