feat: add official Codex skill and harden task execution

Install and update artemis-use with task diagnostics and plugin guidance. Preserve cross-device file receipts, review canonical reports, guard stage transitions and reduce small history summaries. Improve exploration lifecycle, request recovery and browser live connections.

apps/showcase_ui/src/app/components/model-settings/model-settings.component.spec.ts

@@ -1,4 +1,5 @@
-import { TestBed } from '@angular/core/testing';
+import { TestBed, fakeAsync, tick } from '@angular/core/testing';
+import { UI_READ_TIMEOUT_MS } from '../../core/http-timeouts';
 import { provideHttpClient } from '@angular/common/http';
 import { HttpTestingController, provideHttpClientTesting } from '@angular/common/http/testing';
 import { ModelSettingsComponent } from './model-settings.component';
@@ -17,6 +18,18 @@ describe('持久化模型与功能设置', () => {
   });
   afterEach(() => http.verify());
 
+  it('配置请求排队超时后退出加载状态，不会发送保存请求', fakeAsync(() => {
+    const fixture = TestBed.createComponent(ModelSettingsComponent);
+    fixture.detectChanges();
+    const request = http.expectOne('/api/system/model-settings');
+    tick(UI_READ_TIMEOUT_MS);
+    expect(request.cancelled).toBeTrue();
+    expect(fixture.componentInstance.loading()).toBeFalse();
+    expect(fixture.componentInstance.error()).toBeTruthy();
+    expect(fixture.componentInstance.valid()).toBeFalse();
+    http.expectNone('/api/system/model-settings');
+  }));
+
   it('加载配置后保留密钥，保存新模型且不发送空密钥', () => {
     const fixture = TestBed.createComponent(ModelSettingsComponent);
     fixture.detectChanges();