feat(01-03): wire complete startup-to-shutdown pipeline in main.rs
- All four modules declared: mod app, config, signals, terminal
- Pre-terminal phase: login shell detection, CLI parse, config load
- Terminal phase: panic hook installed first, then signals, then terminal init
- Event loop: App::new receives is_login_shell and app_config; run_event_loop runs
- Shutdown: restore_terminal() called before show_goodbye() in all exit paths
- BrokenPipe from event loop exits silently (LIFE-04)
- Unexpected I/O errors logged to stderr after terminal restore
ruohki
771c9a8561
