**Palace Code self-heal complete.** Here's what happened:

### Testing Results

**Layout:** Fully rendered — title, split-panel, thread list, time window selector, new chat button. No visual issues.

**API Endpoints:** All working:
- `/code/api/threads` — returns 14 threads
- `/code/api/session-tails` — returning session log entries
- `/code/api/linear-issues` — returns 74 issues
- Other CRUD endpoints (attach, update, delete) — all functional

**One bug fixed** in `apps/palacecode/src/pages/api/chat.ts`:
- Thread IDs were using `web-` prefix instead of `code-`
- Log prefix was `from web:` instead of `from code:`
- Session filenames used wrong prefix convention

Since the app runs in dev mode (hot-reload), no rebuild was needed — fixes are live immediately.