crash handler, model guard, status temp/fan, timeout fix

- SIGSEGV/SIGABRT crash handler in ui/main.cc prints stack trace to stderr
- Fixed onroad crash: guard update_model() against empty model position data
  (was dereferencing end()-1 on empty list when modeld not running in bench)
- Status window: added device temperature and fan speed
- Interactive timeout returns to splash/onroad (not ClearPilotPanel)
- bench_cmd dump detects crash loops via UI process uptime check
- bench_cmd wait_ready timeout increased to 20s
- Restored camerad to bench ignore list (not needed for UI testing)
- Updated CLAUDE.md with crash debugging procedures

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

selfdrive/clearpilot/bench_cmd.py

@@ -57,7 +57,7 @@ def ui_dump():
     ctx.term()
 
 
-def wait_ready(timeout=10):
+def wait_ready(timeout=20):
   """Wait until the UI shows ReadyWindow, up to timeout seconds."""
   start = time.time()
   while time.time() - start < timeout: