Refresh the v3.8.0 documentation set across API, setup, Docker,
environment, Fly.io, VM deployment, and troubleshooting guides.
Document the updated budget payload, management-auth requirements,
WebSocket bridge secret, Compose profiles, production deployment
details, and expanded Node support. Also update the OpenAPI catalog,
raise coverage thresholds to match the current baseline, and align
cloud-agent task route typing and schemas with the stricter runtime
behavior.
