feat(ADM-018): completed feature

work/artifacts/F-030/documenter.md

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+# Documenter — F-030 E2E suite for critical flows
+
+## Summary
+Adds an end-to-end integration test covering the full checkout flow against real PostgreSQL, plus the empty-cart failure path.
+
+## Test file
+- `project/src/app/tests/e2e/checkout-flow.itest.ts` — happy path (AC1) and empty cart (AC2)
+
+## Evidence
+- work/artifacts/F-030/architect.md
+- work/artifacts/F-030/implementer.md
+- work/artifacts/F-030/reviewer.json
+- work/artifacts/F-030/security.json
+- work/artifacts/F-030/qa.json