A simplified utility like https://github.com/maximbaz/yubikey-touch-detector but only listening for u2f events, and without the yubikey branding.
- detect devices and get interaction needed events
- hysteresis on per-device interaction needed state
- output to unix socket, reuse yubikey-touch-detector protocol for compat
- configure socket path
- output to desktop notification
- configure message based on serial
- detect devices added after startup
- systemd configs
- integrate systemd socket passing