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The ArcBox SSH server: ssh <machine>@arcbox from the Mac.
The daemon runs it on a loopback port. A client authenticates with the
one key the daemon generated for it ([SshKeys]), and the SSH user name
selects the machine ([Target]). Sessions do not run an sshd in the
machine: each shell/exec becomes a login session on the machine exec
path — the guest agent runs the account's shell the way sshd would — with
pty-req, env, window-change, stdin, signals and the exit status
carried over its frames. direct-tcpip channels (ssh -L) become TCP
connections the agent opens inside the machine, carried the same way,
and the sftp subsystem runs the machine's own sftp-server.
[MachineHost] is the seam to the daemon's runtime, and
[write_client_config] the OpenSSH config clients use to find the
server.