Sprint 16 Acceptance Test

Run these checks after pnpm db:migrate, pnpm db:seed, and pnpm dev:lan:

1. Confirm login and sign-out work from http://localhost:3000/login.
2. Confirm login and sign-out work from http://127.0.0.1:3000/login when supported by the browser.
3. Confirm login and sign-out work from http://<PC-IP>:3000/login on the computer and phone.
4. Open /data-quality, /data-quality/issues, /data-quality/duplicates, /data-quality/verifications, /data-quality/ownership, /data-quality/onboarding, /data-quality/usage, /data-quality/daily-operating-checklist, and /data-quality/qa-issues.
5. Open /command-center and confirm Data Quality / Adoption / QA metrics are visible.
6. Confirm real data import dry run still creates zero production records.
7. Confirm People sheet operational/high-risk fields remain notes-only or ignored.
8. Confirm no AI agents, external integrations, live Google Drive sync, customer portal, mobile app, production deployment, or production secrets were added.