feat(ADM-018): completed feature

work/artifacts/F-030/implementer.md

@@ -0,0 +1,21 @@
+# Implementer — F-030 E2E suite for critical flows
+
+## Summary
+Added E2E test `e2e/checkout-flow.itest.ts` exercising the full happy path (register → login admin → seed shipping/price/inventory → add to cart → checkout → assert order AWAITING_PAYMENT + reserved stock) plus empty-cart 409 failure path.
+
+## Files changed
+- `project/src/app/tests/e2e/checkout-flow.itest.ts`
+
+## Acceptance evidence
+- AC1 happy path passes end-to-end against real PostgreSQL; order state and stock reservation asserted.
+- AC2 empty cart returns 409 CHECKOUT_CART_EMPTY without creating an order.
+- AC3 business flow test passes with seeded data.
+
+## Commands run
+- cd project && npm run lint/typecheck/build/test passed (123 passed)
+- DB integration: TEST_DATABASE_URL=... npm run test:integration -- e2e/checkout-flow.itest passed (15 files, 55 tests)
+- ./scripts/verify.sh passed
+
+## Notes
+- Reuses existing db-test-support helpers and buildApp; no new dependencies.
+- audit_log table exists after migration 021; assertion checks table is queryable.