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Every new connection to a machine tty7 had been to before spent six sequential round trips proving what it already had: uname, a home lookup and a stat over SFTP, a control probe and a process scan. The SFTP session it opened also stayed open for the life of the connection, one of the handful of sessions the server allows it. One `sh -c` script now answers the common case: this dialect's server is installed, answers the bridge probe, and is the one running (or a build of the same dialect). Anything else falls through to the full install path unchanged.