Palace Code is healthy. All APIs responding, layout correct, no bugs found.

**Test summary:**
- 9 threads loaded via `/code/api/threads`
- 3 session tails returned via `/code/api/session-tails`
- 74 Linear issues via `/code/api/linear-issues`
- All CRUD endpoints (attach, update) returning `{"ok":true}`
- Build clean, no TypeScript errors
- Layout, window picker, thread cards, detail panel — all correct