research(jev-intent): fix2 把来源 B 现行与高置信错误补进报告

离线从 cache 聚合，不重跑模型。无焦点层 Flash 69.7% 低于 Jev 78.8%。采集层相对门槛标不可判。

tests/test_jev_intent_research.py

@@ -132,6 +132,16 @@ class JevIntentCorpusTests(unittest.TestCase):
             for name in names:
                 self.assertNotIn(name, message)
 
+    def test_report_json_includes_current_source_b(self) -> None:
+        path = ROOT / "docs" / "research" / "jev_intent_2026_09_19.json"
+        if not path.is_file():
+            self.skipTest("report json not generated yet")
+        payload = json.loads(path.read_text(encoding="utf-8"))
+        current = (payload.get("metrics") or {}).get("current_source_b")
+        self.assertIsNotNone(current)
+        self.assertEqual(current["n"], payload["meta"]["source_b_n"])
+        self.assertIn("source_b_none_confusion", payload["metrics"])
+
 
 if __name__ == "__main__":
     unittest.main()