research: score Jev intent variants with the previous turn

The earlier report had no previous-turn rows. This run measures V0, V1, V2, and Flash on the re-extracted corpus and records that the real sample is not representative of the simulated set.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_jev_intent_research.py

@@ -160,6 +160,43 @@ class JevIntentPreviousTurnTests(unittest.TestCase):
         self.assertIsNone(state["previous_turn"])
         self.assertIn("user_message", state)
 
+    def test_closed_focus_is_not_the_current_question(self) -> None:
+        from scripts.research.jev_intent_source_b_v2 import prepare_extract
+
+        rows = prepare_extract([
+            {
+                "turn_id": "open-turn",
+                "case_id": "case-1",
+                "created_at": "2026-09-02T00:00:00+00:00",
+                "user_message": "没有",
+                "assistant_message": "记下了",
+                "case_status": "collecting_evidence",
+                "focus_status": "active",
+                "asked_at": "2026-09-01T00:00:00+00:00",
+                "resolved_at": None,
+                "schema": {"collect": True, "prompt": "有没有换过工作？"},
+            },
+            {
+                "turn_id": "after-close",
+                "case_id": "case-1",
+                "created_at": "2026-09-03T00:00:00+00:00",
+                "user_message": "先看结果",
+                "assistant_message": "还在收",
+                "case_status": "collecting_evidence",
+                "focus_status": "resolved",
+                "asked_at": "2026-09-01T00:00:00+00:00",
+                "resolved_at": "2026-09-02T12:00:00+00:00",
+                "schema": {"collect": True, "prompt": "有没有换过工作？"},
+            },
+        ])
+        by_id = {row["turn_id"]: row for row in rows}
+        self.assertEqual(by_id["open-turn"]["layer"], "collect")
+        self.assertEqual(by_id["open-turn"]["focus"]["current_question"], "有没有换过工作？")
+        self.assertEqual(by_id["after-close"]["layer"], "none")
+        self.assertIsNone(by_id["after-close"]["focus"])
+        self.assertTrue(by_id["after-close"]["focus_stale"])
+        self.assertEqual(by_id["after-close"]["previous_turn"]["user_message"], "没有")
+
 
 class JevIntentCorpusTests(unittest.TestCase):
     def test_source_a_has_ten_labeled_rows(self) -> None: