fix(recall): keep focus entities from recent messages only

modules/story-summary/vector/retrieval/query-builder.js

@@ -312,9 +312,8 @@ export function buildQueryBundle(lastMessages, pendingUserMessage, store = null,
 /**
  * 用第一轮召回结果增强 QueryBundle
  *
- * 原地修改 bundle：
+ * 原地修改 bundle（仅 query/rerank 辅助项）：
  * - hintsSegment：填充 hints 段（供 R2 加权使用）
- * - focusEntities：可能从 anchor hits 的 subject/object 中扩展
  * - lexicalTerms：可能追加 hints 中的关键词
  * - rerankQuery：不变（保持焦点优先的纯自然语言）
  *
@@ -356,38 +355,10 @@ export function refineQueryBundle(bundle, anchorHits, eventHits) {
         bundle.hintsSegment = null;
     }
 
-    // 4. 从 anchorHits 补充 focusEntities
-    const lexicon = bundle._lexicon;
-    const displayMap = bundle._displayMap;
-
-    if (lexicon && topAnchors.length > 0) {
-        const existingSet = new Set(bundle.focusEntities.map(e => e.toLowerCase()));
-
-        for (const hit of topAnchors) {
-            const atom = hit.atom;
-            if (!atom) continue;
-
-            for (const field of [atom.subject, atom.object]) {
-                if (!field) continue;
-                const norm = String(field)
-                    .normalize('NFKC')
-                    .replace(/[\u200B-\u200D\uFEFF]/g, '')
-                    .trim()
-                    .toLowerCase();
-                if (norm.length >= 2 && lexicon.has(norm) && !existingSet.has(norm)) {
-                    existingSet.add(norm);
-                    const display = displayMap?.get(norm) || field;
-                    bundle.focusEntities.push(display);
-                }
-            }
-        }
-    }
-
-    // 5. rerankQuery 不变
+    // 4. rerankQuery 不变
     //    cross-encoder 接收纯自然语言 query，不受 hints 干扰
-    //    焦点消息始终在前，保证 reranker 内部截断时保留最关键内容
 
-    // 6. 增强 lexicalTerms
+    // 5. 增强 lexicalTerms
     if (hints.length > 0) {
         const hintTerms = extractKeyTerms(hints.join(' '), 5);
         const termSet = new Set(bundle.lexicalTerms);