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Names tmux reads as target syntax (`@1`, `%1`, `=eq`, a bare `~`) passed the has-session guard by name and then joined something else in new-session -t: another session, or a fresh shell on the foreign server. They are refused at discovery now, and take the existing skipped note. One stopped tmux server emptied the whole local list and left a stuck client per scan. Each server now gets a bounded ping with stdout at /dev/null first, because a tmux client hands dups of its stdout to the server: a stopped server holds our pipe open after the client is dead, so a watchdog around list-panes cannot work. The probe runs in its own process group, all three transports keep the rows read before a failure, and a missed ping becomes a note. The attach and the probe pass -u, so a POSIX-locale container no longer garbles the tab or lists a non-ASCII name as underscores. A docker attach gets the same TERM and COLORTERM an owned container's exec gets. A missing tmux no longer reads as "session is gone", and the launch line's `$` now reaches bash unexpanded, so the ssh attach's PATH line is expanded at the far end, as the probe's already was. fix-plan/write, fix-plan/read and ralph-prompt/write refuse an adopted session: its workingDir is the neutral /tmp, so they read and wrote a predictable name in a folder anyone can write to. FOREIGN_MAX_SOCKETS is gone: it capped nothing, and a real cap in glob order would never reach `default` on a box with many `codeman-*` sockets (this one has 212). Closing an adopted tab re-reads the outside-sessions list. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>