A command from a missing directory fails ENOENT with no pane; one whose shell never started ends exit 127

Exec made a command pane in a directory that was not there, whose shell
never started: it said running for ever, a follower waited for an exit
that never came, and Kill found it. The line now fails up front, as Tty
does, `exec: <dir>: no such directory`; and a command pane whose shell
the host could not start ends `exit 127` at once. A shell that could not
start in its directory says `directory missing`, not `file not found`.

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

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