Refine memory filtering and lexicon sources for focus entities

modules/story-summary/generate/prompt.js

@@ -826,8 +826,11 @@ async function buildVectorPrompt(store, recallResult, causalById, focusEntities,
         const isDirect = e._recallType === "DIRECT";
         if (!isDirect && relatedBudget.used >= relatedBudget.max) continue;
 
-        // 收集该事件范围内的 EvidenceGroup（per-floor）
-        const evidenceGroups = collectEvidenceGroupsForEvent(e.event, l0Selected, l1ByFloor, usedL0Ids);
+        // 硬规则：RELATED 事件不挂证据（不挂 L0/L1，只保留事件摘要）
+        // DIRECT 才允许收集事件内证据组。
+        const evidenceGroups = isDirect
+            ? collectEvidenceGroupsForEvent(e.event, l0Selected, l1ByFloor, usedL0Ids)
+            : [];
 
         // 格式化事件（含证据）
         const text = formatEventWithEvidence(e, 0, evidenceGroups, causalById);