fix(knowledge): preserve retrieved evidence

backend/ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/service/AihrSopSeedService.java

@@ -3167,7 +3167,8 @@ public class AihrSopSeedService {
             return rawHitResponse(responseCategory, queryText, List.copyOf(docs.values()), snippets, extraCautions);
         }
         if (isNoEvidenceAnswer(digest.answer())) {
-            return noEvidenceResponse(queryText, responseCategory, appendCautions(digest.cautions(), extraCautions));
+            return rawHitResponse(responseCategory, queryText, List.copyOf(docs.values()), snippets,
+                appendCautions(digest.cautions(), extraCautions));
         }
         return new SearchResponse(
             queryText,

backend/ruoyi-modules/ruoyi-aihr/src/test/java/org/dromara/aihr/service/AihrSopSeedServiceTest.java

@@ -45,6 +45,22 @@ public class AihrSopSeedServiceTest {
         assertTrue(response.cautions().contains("未生成结构化概要，已返回命中原文片段。"));
     }
 
+    @Test
+    @Tag("dev")
+    public void digestCannotDiscardAlreadyRetrievedEvidence() throws Exception {
+        Path source = Path.of("src/main/java/org/dromara/aihr/service/AihrSopSeedService.java");
+        if (!Files.exists(source)) {
+            source = Path.of("ruoyi-modules/ruoyi-aihr/src/main/java/org/dromara/aihr/service/AihrSopSeedService.java");
+        }
+        String code = Files.readString(source).replace("\r\n", "\n");
+        String method = code.substring(code.indexOf("private SearchResponse responseFromHits("),
+            code.indexOf("static List<KnowledgeHit> evidenceHits"));
+
+        assertTrue(method.contains("if (isNoEvidenceAnswer(digest.answer()))"));
+        assertTrue(method.contains("return rawHitResponse("));
+        assertFalse(method.contains("return noEvidenceResponse("));
+    }
+
 
     @Test
     @Tag("dev")