The portal had no way to obtain a verified principal: /api/0pt/* requires a
Bearer token, but the browser only had the dev-only HMAC cookie.
- GET /api/auth/login: Authorization Code + PKCE against Zitadel.
- GET /api/auth/callback: code exchange, id_token verification (issuer,
audience, nonce) and a signed session cookie with sub + tenant.
- middleware accepts the signed session as a verified principal; Bearer wins.
- dev login POST is refused in production.
- Sign-in link in the portal shell.
Env-guarded so build stays green: /api/payments/[order_id]/deposit+release + /api/webhooks/stripe (lazy Stripe, 50/50 escrow, 501 until keys); /api/auth login|me|logout (HMAC signed-session scaffold, guarded dev login); lib/engine bridges edge->FastAPI (estimates defers to ENGINE_URL when set); components/embed for NocoDB/Metabase signed URLs; .env.example full inventory. tsc 0, build green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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