feat(summary): update prompt display, metrics lexical gate, and edge sanitization

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

@@ -1,5 +1,10 @@
 // ═══════════════════════════════════════════════════════════════════════════
-// Story Summary - Metrics Collector (v5 - Weighted Query + Floor Aggregation)
+// Story Summary - Metrics Collector (v6 - Dense-Gated Lexical)
+//
+// v5 → v6 变更：
+// - lexical: 新增 eventFilteredByDense / floorFilteredByDense
+// - event: entityFilter bypass 阈值改为 CONFIG 驱动（0.80）
+// - 其余结构不变
 //
 // v4 → v5 变更：
 // - query: 新增 segmentWeights / r2Weights（加权向量诊断）
@@ -44,6 +49,8 @@ export function createMetrics() {
             chunkHits: 0,
             eventHits: 0,
             searchTime: 0,
+            eventFilteredByDense: 0,
+            floorFilteredByDense: 0,
         },
 
         // Fusion (W-RRF, floor-level) - 多路融合
@@ -229,7 +236,14 @@ export function formatMetricsLog(metrics) {
     lines.push(`├─ atom_hits: ${m.lexical.atomHits}`);
     lines.push(`├─ chunk_hits: ${m.lexical.chunkHits}`);
     lines.push(`├─ event_hits: ${m.lexical.eventHits}`);
-    lines.push(`└─ search_time: ${m.lexical.searchTime}ms`);
+    lines.push(`├─ search_time: ${m.lexical.searchTime}ms`);
+    if (m.lexical.eventFilteredByDense > 0) {
+        lines.push(`├─ event_filtered_by_dense: ${m.lexical.eventFilteredByDense}`);
+    }
+    if (m.lexical.floorFilteredByDense > 0) {
+        lines.push(`├─ floor_filtered_by_dense: ${m.lexical.floorFilteredByDense}`);
+    }
+    lines.push(`└─ dense_gate_threshold: 0.50`);
     lines.push('');
 
     // Fusion (W-RRF, floor-level)