Two changes to tests/agent/test_file_safety_session_state.py:
1. Drop the stale monkeypatch on tools.file_tools._get_live_tracking_cwd
— the helper was deleted in the cwd-tracking refactor (c80b244b5),
and monkeypatch.setattr on a missing attribute raises AttributeError,
breaking CI slice 4/8 on main for every PR. The patch was redundant:
the test writes an absolute path, so cwd resolution never engages.
2. Make the fixture stale-proof: instead of monkeypatching the private
_hermes_home_path/_hermes_root_path helpers (same failure class if
they're ever renamed), set HERMES_HOME to <root>/profiles/work and
let the real resolution chain (get_hermes_home /
get_default_hermes_root's profiles-parent rule) derive both paths.
The fixture now references zero private symbols and exercises the
production resolution path.
