**Palace Code self-healing check complete — all systems nominal.**

Here's the summary:

### What Was Tested
- **22 threads** returned from `/code/api/threads` ✓
- **Session tails** endpoint working, file fallback to transcript `.jsonl` ✓
- **Linear issues** — 74 returned ✓
- **Thread operations** — attach, update, delete, sync-linear all returning `{ok: true}` ✓
- **Layout** — split panel, time window selector (1h/6h/12h/1d/3d/7d), thread cards, detail panel all present ✓

### No Bugs Found
No fixes were needed. Palace Code is healthy.