Shell prompt files are one per content under $XDG_RUNTIME_DIR, so a killed pardes leaves none behind; tests remove their /tmp dirs

Every pardes host wrote its own pardes-osc133-bash-* and -fish-* files to /tmp and removed them only at a clean teardown, so each killed session, test and crash left two: 72K of them had piled up. They are now written once per content, named by its hash, in the user's private runtime directory, renamed into place whole and shared by every pardes; without that directory the old private /tmp files remain. fish's -C source is quoted. The 9p_io tests remove their runtime dirs with what the listener left in them, and the snapshot runner removes its retry captures when every retry passed.

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

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