feat(agent): adaptive tool timing with slow tool notification

Track per-tool execution time statistics in session metadata. When a tool
call exceeds its adaptive threshold (2x historical max, min 120s default),
send a direct outbound notification to the user.

- ToolTimingMap: parse/serialize/record/threshold from session metadata
- StartSlowTimer: fires once per tool call, auto-cancels on completion
- Team config: slow_tool toggle (default on, always direct, never leader)
- UI: toggle in team settings with i18n (en/vi/zh)
- Store: add GetSessionMetadata to session store interface

ui/web/src/i18n/locales/en/teams.json

@@ -189,6 +189,8 @@
     "notifyProgressHint": "Notify when a member updates task progress.",
     "notifyFailed": "Task failed",
     "notifyFailedHint": "Notify when a task fails.",
+    "notifySlowTool": "Slow tool alert",
+    "notifySlowToolHint": "System alert when a tool call takes abnormally long. Always direct — never through leader.",
     "notifyMode": "Delivery mode",
     "notifyModeHint": "How notifications are delivered to the chat channel.",
     "notifyModeDirect": "Direct",

ui/web/src/i18n/locales/vi/teams.json

@@ -189,6 +189,8 @@
     "notifyProgressHint": "Thông báo khi thành viên cập nhật tiến trình.",
     "notifyFailed": "Thất bại",
     "notifyFailedHint": "Thông báo khi nhiệm vụ thất bại.",
+    "notifySlowTool": "Cảnh báo tool chạy lâu",
+    "notifySlowToolHint": "Thông báo hệ thống khi tool chạy lâu bất thường. Luôn gửi trực tiếp — không qua leader.",
     "notifyMode": "Chế độ gửi",
     "notifyModeHint": "Cách thông báo được gửi đến kênh chat.",
     "notifyModeDirect": "Trực tiếp",

ui/web/src/i18n/locales/zh/teams.json

@@ -189,6 +189,8 @@
     "notifyProgressHint": "成员更新进度时通知。",
     "notifyFailed": "任务失败",
     "notifyFailedHint": "任务失败时通知。",
+    "notifySlowTool": "工具慢速警报",
+    "notifySlowToolHint": "工具调用异常耗时时发送系统警报。始终直接发送，不通过 leader。",
     "notifyMode": "发送方式",
     "notifyModeHint": "通知如何发送到聊天频道。",
     "notifyModeDirect": "直接发送",

ui/web/src/pages/teams/team-settings-tab.tsx

@@ -75,6 +75,7 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
   const [notifyDispatched, setNotifyDispatched] = useState(initNotify.dispatched ?? true);
   const [notifyProgress, setNotifyProgress] = useState(initNotify.progress ?? true);
   const [notifyFailed, setNotifyFailed] = useState(initNotify.failed ?? true);
+  const [notifySlowTool, setNotifySlowTool] = useState(initNotify.slow_tool ?? true);
   const [notifyMode, setNotifyMode] = useState<"direct" | "leader">(initNotify.mode ?? "direct");
   const [escalationMode, setEscalationMode] = useState<EscalationMode | "">(initial.escalation_mode ?? "");
   const [escalationActions, setEscalationActions] = useState<EscalationAction[]>(initial.escalation_actions ?? []);
@@ -105,6 +106,7 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
     setNotifyDispatched(sn.dispatched ?? true);
     setNotifyProgress(sn.progress ?? true);
     setNotifyFailed(sn.failed ?? true);
+    setNotifySlowTool(sn.slow_tool ?? true);
     setNotifyMode(sn.mode ?? "direct");
     setEscalationMode(s.escalation_mode ?? "");
     setEscalationActions(s.escalation_actions ?? []);
@@ -129,6 +131,7 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
         dispatched: notifyDispatched,
         progress: notifyProgress,
         failed: notifyFailed,
+        slow_tool: notifySlowTool,
         mode: notifyMode,
       };
       if (escalationMode) {
@@ -148,7 +151,7 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
     } finally {
       setSaving(false);
     }
-  }, [teamId, version, allowUserIds, denyUserIds, allowChannels, denyChannels, notifyDispatched, notifyProgress, notifyFailed, notifyMode, escalationMode, escalationActions, followupInterval, followupMaxReminders, workspaceScope, updateTeamSettings, onSaved, t]);
+  }, [teamId, version, allowUserIds, denyUserIds, allowChannels, denyChannels, notifyDispatched, notifyProgress, notifyFailed, notifySlowTool, notifyMode, escalationMode, escalationActions, followupInterval, followupMaxReminders, workspaceScope, updateTeamSettings, onSaved, t]);
 
   const userOptions = knownUsers.map((u) => ({ value: u, label: u }));
   const channelOptions = CHANNEL_TYPES.map((c) => ({ value: c.value, label: c.label }));
@@ -235,6 +238,13 @@ export function TeamSettingsTab({ teamId, team, onSaved }: TeamSettingsTabProps)
                 </div>
                 <Switch checked={notifyFailed} onCheckedChange={setNotifyFailed} />
               </div>
+              <div className="flex items-center justify-between">
+                <div>
+                  <span className="text-sm font-semibold">{t("settings.notifySlowTool")}</span>
+                  <p className="text-xs text-muted-foreground">{t("settings.notifySlowToolHint")}</p>
+                </div>
+                <Switch checked={notifySlowTool} onCheckedChange={setNotifySlowTool} />
+              </div>
               <div className="border-t pt-3 space-y-2">
                 <span className="text-sm font-semibold">{t("settings.notifyMode")}</span>
                 <div className="grid grid-cols-1 gap-2 sm:grid-cols-2">

ui/web/src/types/team.ts

@@ -9,6 +9,7 @@ export interface TeamNotifyConfig {
   dispatched?: boolean;
   progress?: boolean;
   failed?: boolean;
+  slow_tool?: boolean;
   mode?: "direct" | "leader";
 }