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Eliminate SSH fixture execution races in connection tests - #843
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nick-potts
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Co-authored-by: Codex <codex@codex-vm.tailcb9c5.ts.net>
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Connection tests intermittently fail with
ExecutableFileBusywhen another test forks while their generated SSH script is open for writing. Replace the three generated executables with one checked-in fixture. Only the cancellation test needs a temporary symlink to keep its PID file isolated; the timeout test no longer needs an ETXTBSY retry loop. Production SSH behavior is unchanged.Follow-up to #833.
Validation:
connect::testspass, including cancellation, timeout, and retry classification.umask 022; connection tests rerun after fixture simplification.