fix: finish HERMES_HOME path cleanup

- route CLI interrupt debug logging through HERMES_HOME
- update the remaining channel_directory test to patch HERMES_HOME
  instead of Path.home()

tests/gateway/test_channel_directory.py

@@ -203,7 +203,7 @@ class TestBuildFromSessions:
             },
         })
 
-        with patch.object(Path, "home", return_value=tmp_path):
+        with patch.dict(os.environ, {"HERMES_HOME": str(tmp_path)}):
             entries = _build_from_sessions("telegram")
 
         ids = {entry["id"] for entry in entries}