Add L1 attach diagnostics

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

@@ -668,6 +668,10 @@ async function locateAndPullEvidence(anchorHits, anchorFloors, queryVector, rera
 
     for (const floor of selectedFloors) {
         const aiChunks = l1ScoredByFloor.get(floor) || [];
+        xbLog.info(
+            MODULE_ID,
+            `L1 attach check: floor=${floor}, l1ScoredByFloor.has=${l1ScoredByFloor.has(floor)}, aiChunks=${aiChunks.length}, l1ScoredByFloor.keys=[${[...l1ScoredByFloor.keys()].slice(0, 10)}...]`
+        );
         const userFloor = floor - 1;
         const userChunks = (userFloor >= 0 && chat?.[userFloor]?.is_user)
             ? (l1ScoredByFloor.get(userFloor) || [])