Documentation Overhaul

[charlieroth]

Why

Reduce onboarding time and operational errors.

Definition of done

• Top‑level readme includes purpose, architecture diagram, quick start, and contribution guide.
• Interactive interface documentation is reachable at /docs and matches current routes and models.
• Runbook covers configuration, limits, rollouts, backups, and recovery.
• Examples include command line requests for common flows.

Tasks

• Write architecture and data flow sections.
• Verify interface documentation generation and /docs route.
• Expand runbook with day‑two operations.
• Add example requests and expected responses.