fix: resolve legacy evidence targets without guessing and guide retries

backend/wisegrade/scoring.py

@@ -227,6 +227,8 @@ def _score_criterion(db, batch, project, criterion, client, *, retriever, multi_
     prompt = (batch.course_snapshot["prompts"]["score"] +
               " 证据quote必须从所引用chunk_id的text逐字复制连续片段，保留原文标点和换行；page必须等于该片段的page；"
               "target_id必须取自required_evidence_targets。不要改写、缩写或拼接引文。"
+              "每条引文的 target_id 必须属于该片段的 target_ids；同一片段可对应多个目标，"
+              "请按实际内容选择，不要按证据列表顺序分配编号。"
               "不得把目录、摘要或章节标题当作内容证据；无法据此判断内容时把score设为null。")
     error = ""
     result = None
@@ -239,7 +241,11 @@ def _score_criterion(db, batch, project, criterion, client, *, retriever, multi_
             error = str(exc)
             if attempt:
                 raise
-            prompt += f" 上次回答未通过校验（{error}）；请改用允许页面类型中的实质正文片段，并逐字复制quote。"
+            payload["validation_feedback"] = {
+                "error": error,
+                "instruction": "根据具体错误修正输出；引用目标只能从对应片段的 target_ids 选择，"
+                               "quote须为该片段原文。没有足够依据时保留空分，不要编造引用。"}
+            prompt += " 上次回答未通过校验；请按 validation_feedback 修正，不要重复错误引用。"
     score = db.scalar(select(CriterionScore).where(CriterionScore.id == score.id)
                       .with_for_update().execution_options(populate_existing=True))
     if score.status == STATUS_REVIEWED or score.teacher_score is not None: