docs: rebuild documentation from scratch with clean IA

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/operations/overview.md

@@ -1,8 +1,30 @@
-# Operations Documentation
+---
+title: Operations Overview
+sidebar_position: 1
+---
 
-Use this section for production operations and incident/runbook workflows.
+# Operations Overview
 
-- [Scrape Safety Runbook](./scrape-safety-runbook.md)
-- [arXiv Runbook](./arxiv-runbook.md)
-- [Database Runbook](./database-runbook.md)
-- [Migration Rollout Checklist](./migration-checklist.md)
+This section covers production deployment, database administration, and scrape safety operations.
+
+## Quick Links
+
+| Guide | Description |
+|-------|-------------|
+| [Deployment](deployment.md) | Production Docker setup, scaling, health checks |
+| [Database Runbook](database-runbook.md) | Backup, restore, integrity checks, repair procedures |
+| [Scrape Safety Runbook](scrape-safety-runbook.md) | Rate limiting, cooldowns, CAPTCHA handling |
+| [arXiv Runbook](arxiv-runbook.md) | arXiv rate limits, cache tuning, query patterns |
+
+## Health Check
+
+The app exposes `GET /healthz` for container orchestration:
+
+```bash
+curl -fsS http://localhost:8000/healthz
+```
+
+Docker Compose healthcheck config:
+- Interval: 10s
+- Timeout: 5s
+- Retries: 12