- log the worker thread's exception when a workspace op raises during
caller cancellation, so a persistently failing setup surfaces instead
of being buried behind CancelledError.
- raise on a timed-out (124) git symbolic-ref probe in the repo-exists
path, matching the rev-parse probes, instead of silently accepting the
caller-supplied branch.
- assert the subprocess timeout is passed in the two _chown_workspace
test fakes so a refactor cannot silently drop the bound.
Op: correct
Restores: spec:indeterminate-git-probes-raise-not-silently-proceed
metaphorics
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