- SignalFlags struct wraps Arc<AtomicBool> for SIGHUP/SIGTERM
- register_signals() registers SIGHUP and SIGTERM only (not SIGINT)
- SIGINT deliberately excluded — handled via crossterm key events for double-press Ctrl+C
- should_terminate() polls flag with Ordering::Relaxed for event loop use
- init_logging() is a Phase 1 no-op stub with LIFE-03 documentation
- init_terminal() enables raw mode and clears main screen via Viewport::Fullscreen
- No alternate screen buffer used (deliberate BBS immersive approach)
- restore_terminal() disables raw mode and shows cursor using let _ for all calls
- install_panic_hook() restores terminal, prints BBS-themed message, delegates to original hook
- Use ratatui::crossterm re-export (crossterm is transitive dep only)
- All panic hook operations use let _ or eprintln! — no unwrap() or ? inside hook
ruohki
