feat(recall): add diffusion stage and improve retrieval metrics

modules/story-summary/vector/retrieval/entity-lexicon.js

@@ -8,6 +8,8 @@
 // 硬约束：name1 永不进入词典
 // ═══════════════════════════════════════════════════════════════════════════
 
+import { getStateAtoms } from '../storage/state-store.js';
+
 /**
  * 标准化字符串（用于实体匹配）
  * @param {string} s
@@ -69,6 +71,14 @@ export function buildEntityLexicon(store, context) {
         add(f.s);
     }
 
+    // 5. L0 atoms 的 who（新角色在 L2 总结前即可进入词典）
+    const atoms = getStateAtoms();
+    for (const atom of atoms) {
+        for (const name of (atom.who || [])) {
+            add(name);
+        }
+    }
+
     // ★ 硬约束：删除 name1
     if (context?.name1) {
         lexicon.delete(normalize(context.name1));
@@ -112,6 +122,14 @@ export function buildDisplayNameMap(store, context) {
         if (!f.retracted) register(f.s);
     }
 
+    // 5. L0 atoms 的 who
+    const atoms = getStateAtoms();
+    for (const atom of atoms) {
+        for (const name of (atom.who || [])) {
+            register(name);
+        }
+    }
+
     // ★ 硬约束：删除 name1
     if (context?.name1) {
         map.delete(normalize(context.name1));