The SETUP_HITS check matched any file ending in setup.py/setup.cfg/
sitecustomize.py/usercustomize.py at any path depth. This produced
false positives on every PR touching hermes_cli/setup.py (the CLI
setup wizard), which is unrelated to pip/site install hooks.
Only the top-level setup.py/setup.cfg execute during 'pip install',
and only top-level sitecustomize.py/usercustomize.py are auto-loaded
by site.py at interpreter startup. Anchor the regex with '^' so only
repo-root matches fire.
Symptom: PR #30916 (Mattermost plugin migration) flagged purely
because it deletes _setup_mattermost() from hermes_cli/setup.py.
Discord migration (#30591) hit the same false positive yesterday.
be89c2e4fa