fix: resolve test suite regressions and conn helper discovery error

tests/test_namespace_workspace_binding.py

@@ -103,6 +103,8 @@ class TestNamespaceWorkspaceIntegration(unittest.TestCase):
         srv._preflight_in_test_mode = lambda: False
         self._env_patch = mock.patch.dict(os.environ, {"GITEA_TEST_PORCELAIN": ""}, clear=False)
         self._env_patch.start()
+        self._guard_patch = mock.patch("gitea_mcp_server._enforce_root_checkout_guard")
+        self._guard_patch.start()
 
     def tearDown(self):
         srv._preflight_whoami_called = self._saved["whoami_called"]
@@ -112,6 +114,7 @@ class TestNamespaceWorkspaceIntegration(unittest.TestCase):
         srv._preflight_capability_violation = self._saved["capability_violation"]
         srv._preflight_in_test_mode = self._saved["in_test"]
         self._env_patch.stop()
+        self._guard_patch.stop()
         for key in (
             nwb.AUTHOR_WORKTREE_ENV,
             nwb.MERGER_WORKTREE_ENV,