refactor(prompt): remove nearby L0 fallback attachment to avoid wrong event binding

modules/story-summary/generate/prompt.js

@@ -52,9 +52,6 @@ const SUMMARIZED_EVIDENCE_MAX = 1500;
 const UNSUMMARIZED_EVIDENCE_MAX = 5000;
 const TOP_N_STAR = 5;
 
-// 邻近补挂：未被事件消费的 L0，如果距最近事件 ≤ 此值则补挂
-const NEARBY_FLOOR_TOLERANCE = 2;
-
 // L0 显示文本：分号拼接 vs 多行模式的阈值
 const L0_JOINED_MAX_LENGTH = 120;
 // 背景证据：无实体匹配时保留的最低相似度（与 recall.js CONFIG.EVENT_ENTITY_BYPASS_SIM 保持一致）
@@ -945,68 +942,6 @@ async function buildVectorPrompt(store, recallResult, causalById, focusEntities,
     // 每个 L0 只挂最近的一个事件，不扩展事件范围，不产生重叠
     // ═══════════════════════════════════════════════════════════════════
 
-    const allSelectedItems = [...selectedDirect, ...selectedRelated];
-    const nearbyByItem = new Map();
-
-    for (const l0 of l0Selected) {
-        if (usedL0Ids.has(l0.id)) continue;
-
-        let bestItem = null;
-        let bestDistance = Infinity;
-
-        for (const item of allSelectedItems) {
-            const range = parseFloorRange(item.event?.summary);
-            if (!range) continue;
-
-            let distance;
-            if (l0.floor < range.start) distance = range.start - l0.floor;
-            else if (l0.floor > range.end) distance = l0.floor - range.end;
-            else continue;
-
-            if (distance <= NEARBY_FLOOR_TOLERANCE && distance <= bestDistance) {
-                bestDistance = distance;
-                bestItem = item;
-            }
-        }
-
-        if (bestItem) {
-            if (!nearbyByItem.has(bestItem)) nearbyByItem.set(bestItem, []);
-            nearbyByItem.get(bestItem).push(l0);
-            usedL0Ids.add(l0.id);
-        }
-    }
-
-    for (const [item, nearbyL0s] of nearbyByItem) {
-        const floorMap = groupL0ByFloor(nearbyL0s);
-
-        for (const [floor, l0s] of floorMap) {
-            const group = buildEvidenceGroup(floor, l0s, l1ByFloor);
-            item.evidenceGroups.push(group);
-        }
-
-        item.evidenceGroups.sort((a, b) => a.floor - b.floor);
-
-        const newText = formatEventWithEvidence(item, 0, item.evidenceGroups, causalById);
-        const newTokens = estimateTokens(newText);
-        const delta = newTokens - item.tokens;
-
-        if (total.used + delta > total.max) {
-            for (const l0 of nearbyL0s) usedL0Ids.delete(l0.id);
-            continue;
-        }
-
-        total.used += delta;
-        eventBudget.used += delta;
-
-        const isDirect = selectedDirect.includes(item);
-        if (!isDirect) relatedBudget.used += delta;
-
-        injectionStats.evidence.l0InEvents += nearbyL0s.length;
-        item.text = newText;
-        item.tokens = newTokens;
-        injectionStats.event.tokens += delta;
-    }
-
     // 重新编号 + 星标
     const directEventTexts = selectedDirect.map((it, i) => {
         const numbered = renumberEventText(it.text, i + 1);