feat(h5): web 联网能力、实时查询路由与 session Finish 对齐

- 新增 web 能力并挂载 platform/web（web_search/fetch_url）
- 实时查询强制 web skill，router fallback 与 await session Finish
- Session Broker 覆盖率/指标、stream replay 与相关单测/E2E 脚本

Co-authored-by: Cursor <cursoragent@cursor.com>

agent-run-gateway.mjs

@@ -3,7 +3,7 @@ import fs from 'node:fs/promises';
 import path from 'node:path';
 import { isRunStreamReplayEnabled } from './agent-run-stream.mjs';
 import { isDirectChatSessionId } from './direct-chat-service.mjs';
-import { CHAT_INTENT_ROUTE, resolveLegacyRouteFromClassification } from './chat-intent-router.mjs';
+import { CHAT_INTENT_ROUTE, resolveGatewayAgentSessionId, resolveLegacyRouteFromClassification, logRouterDecisionShadow } from './chat-intent-router.mjs';
 import { resolveSessionAccess } from './session-broker.mjs';
 import {
   loadSnapshotMessages,
@@ -21,6 +21,12 @@ const DEFAULT_RUN_TIMEOUT_MS = 15 * 60 * 1000;
 const DEFAULT_RUN_HEARTBEAT_MS = 30 * 1000;
 const TOOL_GATEWAY_SUMMARY_LIMIT = 4096;
 
+function envFlag(value, fallback = false) {
+  const raw = String(value ?? '').trim().toLowerCase();
+  if (!raw) return fallback;
+  return ['1', 'true', 'yes', 'on'].includes(raw);
+}
+
 function nowMs() {
   return Date.now();
 }
@@ -33,6 +39,12 @@ function safeJsonParse(value, fallback = null) {
   }
 }
 
+function parseDbJsonColumn(value, fallback = null) {
+  if (value == null || value === '') return fallback;
+  if (typeof value === 'object') return value;
+  return safeJsonParse(value, fallback);
+}
+
 function serializeMessage(message) {
   return JSON.stringify(message ?? {});
 }
@@ -49,12 +61,6 @@ function timeoutError(ms) {
   return err;
 }
 
-function envFlag(value, fallback = false) {
-  const raw = String(value ?? '').trim().toLowerCase();
-  if (!raw) return fallback;
-  return ['1', 'true', 'yes', 'on'].includes(raw);
-}
-
 export function normalizeAgentRunToolMode(value) {
   const normalized = String(value ?? 'chat').trim().toLowerCase();
   if (!normalized || normalized === 'chat') return 'chat';
@@ -471,6 +477,10 @@ export function createAgentRunGateway({
     const routing = await resolveRunRouting(row, userMessage, runOptions);
     const routingDecision = resolveLegacyRouteFromClassification(routing) ?? routing?.route ?? null;
     if (routing) {
+      logRouterDecisionShadow(routing, {
+        requestId: row.request_id ?? null,
+        sessionId: row.agent_session_id ?? null,
+      });
       await appendEvent(runId, 'intent_routed', routing);
       if (routingDecision === CHAT_INTENT_ROUTE.AGENT && chatIntentRouter?.applyAgentOrchestration) {
         const grantedSkills = await resolveGrantedSkills(row.user_id);
@@ -578,7 +588,11 @@ export function createAgentRunGateway({
       return { sessionId: row.agent_session_id ?? null };
     }
 
-    let sessionId = row.agent_session_id ?? null;
+    let sessionId = resolveGatewayAgentSessionId({
+      agentSessionId: row.agent_session_id ?? null,
+      classification: routing,
+      forceDeepReasoning: runOptions.forceDeepReasoning,
+    });
     let escalatedDirectSessionId = null;
     if (isDirectChatSessionId(sessionId)) {
       escalatedDirectSessionId = sessionId;
@@ -640,16 +654,37 @@ export function createAgentRunGateway({
       });
     }
     await invalidatePortalDirectChatSnapshot(sessionId);
-    await tkmindProxy.submitSessionReplyForUser(
-      row.user_id,
-      sessionId,
-      row.request_id,
-      ensureGooseUserMessageMetadata(userMessage),
-      {
-        toolMode: runOptions.toolMode,
-        forceDeepReasoning: runOptions.forceDeepReasoning,
-      },
-    );
+    const awaitSessionFinish = envFlag(process.env.MEMIND_AGENT_RUN_AWAIT_SESSION_FINISH, true)
+      && runOptions.toolMode === 'chat'
+      && typeof tkmindProxy.submitSessionReplyAndAwaitFinishForUser === 'function';
+    if (awaitSessionFinish) {
+      const finish = await tkmindProxy.submitSessionReplyAndAwaitFinishForUser(
+        row.user_id,
+        sessionId,
+        row.request_id,
+        ensureGooseUserMessageMetadata(userMessage),
+        {
+          toolMode: runOptions.toolMode,
+          forceDeepReasoning: runOptions.forceDeepReasoning,
+          timeoutMs: runTimeoutMs,
+        },
+      );
+      await appendEvent(runId, 'session_finished', {
+        sessionId,
+        tokenState: finish.tokenState ?? null,
+      });
+    } else {
+      await tkmindProxy.submitSessionReplyForUser(
+        row.user_id,
+        sessionId,
+        row.request_id,
+        ensureGooseUserMessageMetadata(userMessage),
+        {
+          toolMode: runOptions.toolMode,
+          forceDeepReasoning: runOptions.forceDeepReasoning,
+        },
+      );
+    }
     return { sessionId };
   }
 
@@ -966,7 +1001,7 @@ export function createAgentRunGateway({
       events: rows.map((row) => ({
         id: row.id,
         eventType: row.event_type,
-        data: row.data_json ? JSON.parse(row.data_json) : null,
+        data: parseDbJsonColumn(row.data_json, null),
         createdAt: Number(row.created_at),
       })),
       cursorMiss,