Connection-time shortcuts
Add a connection-time command path, via SSH username and/or SSH execution mode, to directly connect to e.g. specific session in a Chroniton for control, a new session on a Chroniton, initiation of a historical playback, attachment to a session for live viewing, user/invitation management, and possibly even genesis/backstep operations without needing to go through the full interactive UI.
Username is not currently used at all (for authentication or otherwise), and since some commands may require a PTY allocation by the client, they cannot all be covered by providing a command to execute on the server via the SSH command line.