Function connection_handler_with_executor 

pub async fn connection_handler_with_executor<S>(
    stream: S,
    state: DaemonState,
    runner: Arc<dyn CommandRunner + Send + Sync>,
    executor: Arc<dyn ActionExecutor>,
    caller: CallerAttribution,
)
where
    S: AsyncRead + AsyncWrite + Unpin + Send + 'static,

Inner handler that accepts an explicit ActionExecutor.

Production code enters via unix_connection_handler or vsock_connection_handler; tests call this directly with a mock executor.