주기 SSE 검증 하네스 수정

scripts/test_run_periodic_learner_e2e.py

@@ -26,6 +26,11 @@ def load_module() -> ModuleType:
 runner = load_module()
 
 
+class PeriodicRunnerStaticContractTests(unittest.TestCase):
+    def test_browser_failures_are_not_retried_automatically(self) -> None:
+        self.assertEqual(runner.PLAYWRIGHT_RETRIES, 0)
+
+
 class FakeController:
     def __init__(self, *, tracked_status: str = "") -> None:
         self.tracked_status = tracked_status