docs: add canonical IA landing + first-pass core pages

docs/09-ops-runbooks.md

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+# Ops / runbooks
+
+This page is the operator/SRE entry point. It intentionally links to existing deeper docs to minimize churn.
+
+## Where to start
+- Deployment: [docs/deployment/README.md](deployment/README.md)
+- Production checklist/notes: [docs/production/README.md](production/README.md)
+- Troubleshooting: [docs/troubleshooting/README.md](troubleshooting/README.md)
+
+## “First 30 minutes” incident checklist
+
+1. **Confirm user impact + scope**
+   - What is broken: UI, API, auth, or gateway integration?
+   - Is it all users or a subset?
+
+2. **Check service health**
+   - Backend: `/healthz` and `/readyz`
+   - Frontend: can it load? does it reach the API?
+
+3. **Check auth (Clerk) configuration**
+   - Frontend: is Clerk enabled unexpectedly? (publishable key set)
+   - Backend: is `CLERK_JWKS_URL` configured correctly?
+
+4. **Check DB connectivity**
+   - Can backend connect to Postgres (`DATABASE_URL`)?
+
+5. **Check logs**
+   - Backend logs for 5xx spikes or auth failures.
+   - Frontend logs for proxy/API URL misconfig.
+
+6. **Stabilize**
+   - Roll back the last change if available.
+   - Temporarily disable optional integrations (gateway) to isolate.
+
+## Backups / restore (placeholder)
+- Define backup cadence and restore steps once production deployment is finalized.
+