- Share one HERMES_CRON_TIMEOUT parser (_cron_inactivity_seconds) between
run_job's inactivity monitor and the cwd-lock bound so the two sites
cannot drift - the bound must stay >= the inactivity limit or waiters
would fail while a healthy holder runs.
- Bind the timeout once per run_job; the raise reports the value that was
actually used for the wait.
- Timeout message covers the writer-blocked-by-readers path instead of
always blaming a workdir job.
- The finally's TERMINAL_CWD restore is now gated on _cwd_lock_acquired:
a fail-closed timeout raised before the env-set, so restoring there
replayed a pre-wait snapshot over the ACTIVE holder's live override
(pre-existing microsecond race from the #80912 snapshot placement).
- Comment accuracy: the bound is measured from the waiter's arrival; a
late-wedging or pre-agent-hung holder can outlive it.
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