Palace Code is fully healthy. Here's what was tested:

**Layout**: Full-screen split-panel layout renders correctly — 340px thread list on left, detail panel on right, header with Palace Code title and new chat button, time window selector (1h/6h/12h/1d/3d/7d).

**All API endpoints passing**:
- `/code/api/threads` — returns threads (9 in 1d window, correctly filtered by time window)
- `/code/api/session-tails` — returns session log entries
- `/code/api/linear-issues` — 74 issues loaded
- `/code/api/attach-thread`, `update-thread`, `delete-thread`, `sync-linear` — all operational

**Frontend features**:
- Time window filtering works (1h=0, 6h=3, 1d=9, 3d=15 threads)
- Thread polling every 3 seconds
- Auto-attach to Linear issues
- Swipe-to-delete/archive with undo timer
- Status badge click-to-change

No bugs found. No fixes needed.