Function run_daemon 

pub fn run_daemon(
    listener: &TcpListener,
    injector: Arc<dyn Injector>,
    opts: &DaemonOptions,
) -> Result<(), AppError>

Run the daemon accept loop: each connection streams NDJSON; every received InjectionCommand (from a cast frame or a bare line) is replayed through injector. One thread per connection (mirrors relay::serve).

Errors

AppError::internal on a fatal accept error.