Three small follow-ups from the review:
1. Remove the over-broad except Exception around get_active_hermes_home()
in _handle_cron_run. The function is in-memory dict reads + one
Path.is_dir() stat — if it raises from inside a request handler,
api.profiles is in a state we shouldn't be making cron decisions in.
A silent fallback to _profile_home=None re-introduces the exact
bug #1573 fixes (worker thread runs unpinned against process-global
HERMES_HOME). Better to 500 the request than risk silent cross-
profile state corruption.
2. Add a thread-safety note on os.environ mutation in api/profiles.py
explaining why _cron_env_lock is sufficient — CPython env-var
assignment is GIL-protected at the bytecode level but the multi-step
read-modify-write pattern (snapshot prev → assign new → restore on
exit) is not atomic without explicit serialization. The lock makes
the entire context-manager body run-to-completion serially, including
any subprocess.Popen() calls inside run_job() that inherit the env.
3. New regression test (test_cron_run_does_not_silently_swallow_profile_resolution_errors)
pinning the no-silent-fallback contract via source-level assertion.
Catches future re-introduction of the over-broad except clause.
Co-authored-by: kowenhaoai <kowenhaoai@users.noreply.github.com>
