Function handle_connection 

pub async fn handle_connection<S>(
    stream: S,
    op_tx: UnboundedSender<ControlOp>,
    events: Sender<WorldEvent>,
    token: Option<ControlToken>,
) -> Result<()>
where
    S: AsyncRead + AsyncWrite + Unpin,

Serve one accepted connection: read newline-delimited requests, dispatch each to the host via op_tx, and write back its response line. Returns when the client hangs up or on an I/O error. A malformed request line gets an Error response and the connection continues.

Generic over the stream so the same logic serves a Unix socket or a Windows named pipe. The accept loop that produces the streams (and owns the socket’s lifecycle) lives with the daemon; this is the reusable per-connection half.