Adds `uncaged-workflow serve` command that exposes workflow data
via a local HTTP API for the upcoming Web UI (RFC #118 Phase 1).
Routes:
- GET /healthz — health check
- GET /api/workflows — list registered workflows
- GET /api/workflows/:name — show workflow details
- GET /api/workflows/:name/history — version history
- GET /api/threads — list threads (optional ?workflow= filter)
- GET /api/threads/running — list running threads
- GET /api/threads/:id — show thread records (parsed JSONL)
- GET /api/cas — list CAS hashes
- GET /api/cas/:hash — get CAS content
- POST /api/cas — store content, returns hash
- DELETE /api/cas/:hash — remove CAS entry
- POST /api/cas/gc — garbage collect
Default: 127.0.0.1:7860, configurable via --port/-p and --host.
Refs: #118
xingyue
3ed38c65ec