feat: complete quality/observability/KB port batch

docs/go-live.md

@@ -375,6 +375,9 @@ curl -s http://127.0.0.1:4100/metrics | head
 # RAG 检索评测
 RAG_PG_URL=postgres://...@127.0.0.1:5440/bridge node scripts/eval-retrieval.js
 
+# KB 审计
+RAG_PG_URL=postgres://...@127.0.0.1:5440/bridge node scripts/kb-audit.js
+
 # KB 备份列表 / 回滚
 RAG_PG_URL=postgres://...@127.0.0.1:5440/bridge node scripts/kb-version.js list
 RAG_PG_URL=postgres://...@127.0.0.1:5440/bridge node scripts/kb-version.js rollback kb_docs_v...
@@ -390,6 +393,9 @@ RAG_PG_URL=postgres://...@127.0.0.1:5440/bridge node scripts/kb-version.js rollb
 - 完整会话 Note 挂商机
 - A/B 实验分流
 - Prometheus `/metrics`
+- `agent_trace_steps` 明细（`TRACE_ENABLED=true`）
+- A/B 实验 `bridge/config/experiments.json`
+- collect_info LLM 兜底提取
 
 ## 8. 监控与告警