An editor killed with SIGTERM or SIGHUP removes its 9P socket, and a start sweeps the pardes-9p-<pid>.sock files whose pid is gone

The runtime directory had gathered a hundred sockets of dead editors:
only a clean exit removed its own, and a signal or a crash left it. The
terminal's kill handler and, where nothing else handles the signals, a
handler of the listener's own now unlink the socket before the signal's
death. At listen, each pardes-9p-<pid>.sock whose pid kill(pid, 0)
answers ESRCH for, that is a socket of this user's and that nothing
answers on, is removed; a live pid's, a named session's and anything
else are never touched.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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