fix(recall): keep only matched atoms and filter evidence by focus entities

modules/story-summary/vector/retrieval/recall.js

@@ -723,18 +723,21 @@ async function locateAndPullEvidence(anchorHits, queryVector, rerankQuery, lexic
     // 6g. 收集 L0 atoms + L1 top-1 配对
     // ─────────────────────────────────────────────────────────────────
 
-    const atomsList = getStateAtoms();
-    const atomsByFloor = new Map();
-    for (const atom of atomsList) {
-        if (typeof atom.floor !== 'number' || atom.floor < 0) continue;
-        if (!atomsByFloor.has(atom.floor)) atomsByFloor.set(atom.floor, []);
-        atomsByFloor.get(atom.floor).push(atom);
+    // 仅保留“真实 dense 命中”的 L0 原子：
+    // 旧逻辑按 floor 全塞，容易把同层无关原子带进来。
+    const atomById = new Map(getStateAtoms().map(a => [a.atomId, a]));
+    const matchedAtomsByFloor = new Map();
+    for (const hit of (anchorHits || [])) {
+        const atom = hit.atom || atomById.get(hit.atomId);
+        if (!atom) continue;
+        if (!matchedAtomsByFloor.has(hit.floor)) matchedAtomsByFloor.set(hit.floor, []);
+        matchedAtomsByFloor.get(hit.floor).push({
+            atom,
+            similarity: hit.similarity,
+        });
     }
-
-    const denseFloorMaxMap = new Map();
-    for (const a of (anchorHits || [])) {
-        const cur = denseFloorMaxMap.get(a.floor) || 0;
-        if (a.similarity > cur) denseFloorMaxMap.set(a.floor, a.similarity);
+    for (const arr of matchedAtomsByFloor.values()) {
+        arr.sort((a, b) => b.similarity - a.similarity);
     }
 
     const l0Selected = [];
@@ -744,15 +747,15 @@ async function locateAndPullEvidence(anchorHits, queryVector, rerankQuery, lexic
     for (const item of reranked) {
         const floor = item.floor;
         const rerankScore = item._rerankScore || 0;
-        const denseSim = denseFloorMaxMap.get(floor) || 0;
 
-        const floorAtoms = atomsByFloor.get(floor) || [];
-        for (const atom of floorAtoms) {
+        // 仅收集该 floor 中真实命中的 L0 atoms
+        const floorMatchedAtoms = matchedAtomsByFloor.get(floor) || [];
+        for (const { atom, similarity } of floorMatchedAtoms) {
             l0Selected.push({
                 id: `anchor-${atom.atomId}`,
                 atomId: atom.atomId,
                 floor: atom.floor,
-                similarity: denseSim,
+                similarity,
                 rerankScore,
                 atom,
                 text: atom.semantic || '',