fix: export notifyTeamWatchScopeChanged so the committed build resolves

TeamProvisioningService imports notifyTeamWatchScopeChanged (added with the
setAliveRunId/deleteAliveRunId helpers) but the export was missing, so a clean
checkout of the branch failed to typecheck. Add the export plus a test; the
call-site wiring stays as in-progress work.

src/main/services/infrastructure/teamWatchScope.ts

@@ -25,6 +25,10 @@ export function setTeamWatchScopeChangeListener(listener: (() => void) | null):
   scopeChangeListener = listener;
 }
 
+export function notifyTeamWatchScopeChanged(): void {
+  scopeChangeListener?.();
+}
+
 function collectAliveTeams(scope: Set<string>): void {
   if (!aliveTeamsProvider) {
     return;

test/main/services/infrastructure/teamWatchScope.test.ts

@@ -3,6 +3,7 @@ import { afterEach, describe, expect, it, vi } from 'vitest';
 import {
   computeTeamWatchScope,
   markTeamEngaged,
+  notifyTeamWatchScopeChanged,
   resetTeamWatchScopeForTests,
   setAliveTeamsProvider,
   setTeamWatchScopeChangeListener,
@@ -53,6 +54,13 @@ describe('teamWatchScope', () => {
     expect(listener).not.toHaveBeenCalled();
   });
 
+  it('can notify after alive team scope changes outside engagement', () => {
+    const listener = vi.fn();
+    setTeamWatchScopeChangeListener(listener);
+    notifyTeamWatchScopeChanged();
+    expect(listener).toHaveBeenCalledTimes(1);
+  });
+
   it('survives a throwing alive provider (watcher falls back safely)', () => {
     setAliveTeamsProvider(() => {
       throw new Error('boom');