fix: resolve test suite regressions and conn helper discovery error

tests/test_lock_issue_mcp_registration.py

@@ -97,7 +97,7 @@ class TestCreatePrLockRegistrationFlow(unittest.TestCase):
         "mcp_server.issue_lock_worktree.read_worktree_git_state",
         return_value=_clean_master_git_state_for_lock(),
     )
-    @patch("mcp_server.api_get_all", return_value=[])
+    @patch("mcp_server.api_get_all", return_value=[{"id": 4, "name": "status:pr-open"}])
     @patch("mcp_server.role_session_router.check_author_mutation_after_reviewer_stop",
            return_value=(True, []))
     @patch("mcp_server.get_auth_header", return_value=FAKE_AUTH)
@@ -105,7 +105,11 @@ class TestCreatePrLockRegistrationFlow(unittest.TestCase):
         self, _auth, _role, _api, _git_state, mock_api_request
     ):
         worktree = os.path.realpath(os.getcwd())
-        mock_api_request.return_value = {"number": 521, "html_url": "https://example/pr/521"}
+        def mock_api(method, url, auth, data=None):
+            if "/labels" in url:
+                return [{"name": "status:pr-open"}]
+            return {"number": 521, "html_url": "https://example/pr/521"}
+        mock_api_request.side_effect = mock_api
         lock_res = gitea_lock_issue(
             issue_number=521,
             branch_name="feat/issue-521-lock-issue-registration",