Serve API:
- POST /api/threads — run a new thread
- POST /api/threads/:id/kill — kill thread
- POST /api/threads/:id/pause — pause thread
- POST /api/threads/:id/resume — resume thread
- GET /api/threads/:id/live — SSE stream of thread records
Dashboard:
- Run Thread dialog (select workflow, enter prompt, set maxRounds)
- Thread detail controls (pause/resume/kill buttons)
- postJson API helper for write operations
262 tests pass. Refs: #118
xingyue