feat: add selector_scores observation column to question_gen_items

app/question_gen/run_store.py

@@ -125,6 +125,7 @@ CREATE TABLE IF NOT EXISTS question_gen_items (
     gate_reject_reason TEXT,
     final_status      TEXT NOT NULL DEFAULT 'pending',
     difficulty_steps  INTEGER,
+    selector_scores   TEXT,
     created_at        TEXT NOT NULL DEFAULT (datetime('now'))
 );
 """
@@ -177,11 +178,14 @@ class QuestionGenStore:
             self._conn.execute(idx_sql)
         self._conn.commit()
 
-        # 幂等迁移：为已有表加 sub_pattern 列
+        # 幂等迁移：为已有表加 sub_pattern / selector_scores 列
         cols = {r[1] for r in self._conn.execute("PRAGMA table_info(question_gen_items)")}
         if "sub_pattern" not in cols:
             self._conn.execute("ALTER TABLE question_gen_items ADD COLUMN sub_pattern TEXT")
             self._conn.commit()
+        if "selector_scores" not in cols:
+            self._conn.execute("ALTER TABLE question_gen_items ADD COLUMN selector_scores TEXT")
+            self._conn.commit()
 
     def record_run_start(self, run_id: str, git_sha: str, config_snapshot: str) -> None:
         """记录批次开始。
@@ -378,6 +382,29 @@ class QuestionGenStore:
         if cursor.rowcount == 0:
             raise ValueError(f"item_id 不存在: {item_id}")
 
+    def update_selector_scores(self, item_id: str, selector_scores_json: str) -> None:
+        """写入 grounded selector 打分观测（JSON 字符串）。
+
+        Parameters
+        ----------
+        item_id : str
+            题目唯一 ID。
+        selector_scores_json : str
+            观测 JSON：correct_score / chosen / pool_size / anneal_rounds / hard_fail。
+
+        Raises
+        ------
+        ValueError
+            item_id 不存在时抛出。
+        """
+        cursor = self._conn.execute(
+            "UPDATE question_gen_items SET selector_scores=? WHERE item_id=?",
+            (selector_scores_json, item_id),
+        )
+        self._conn.commit()
+        if cursor.rowcount == 0:
+            raise ValueError(f"item_id 不存在: {item_id}")
+
     def get_run_stats(self, run_id: str) -> RunStats:
         """查询批次统计摘要。