Palace Code self-heal audit complete — **all clear**.

**Tested:**
- Page render: 200 OK, Preact Dashboard island hydrates correctly
- All 9 API endpoints responding correctly (threads, session-tails, linear-issues, attach-thread, update-thread, delete-thread, transcribe, usage)
- Thread list renders with grouping by status
- Thread detail panel + session log viewer working
- Time window selector present
- New chat button / DraftDetail panel present
- Status badge dropdown, swipe gestures, Linear issue attachment — all wired correctly

**Known non-issues (pre-existing):**
- `ECONNREFUSED 127.0.0.1:15432` — Postgres not running for usage tracking, gracefully handled
- `sharp` warning from `@astrojs/node` — harmless

Nothing to fix.