Block publish when LLM rewrite quality degrades

tests/test_legacy_script_delegation.py

@@ -52,6 +52,19 @@ class LegacyScriptDelegationTests(unittest.TestCase):
         self.assertEqual(calls[0]["source_mode"], "mock")
         self.assertEqual(calls[0]["llm_mode"], "mock")
 
+    def test_main_exits_nonzero_when_new_pipeline_blocks_publish(self):
+        module = load_pipeline_module()
+
+        def fake_run_daily_report(**kwargs):
+            return {"reports": {"stage8": {"status": "blocked", "error": "rewrite_fallback_ratio_exceeded"}}}
+
+        with patch.object(module, "load_env", return_value={}):
+            with patch("ai_daily_report.runner.run_daily_report", side_effect=fake_run_daily_report):
+                with self.assertRaises(SystemExit) as raised:
+                    module.main()
+
+        self.assertEqual(raised.exception.code, 2)
+
 
 if __name__ == "__main__":
     unittest.main()