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/floating-video-player/floating-video-player.component.spec.ts

@@ -98,6 +98,24 @@ describe('FloatingVideoPlayerComponent video markers', () => {
     fixture.detectChanges();
   }
 
+  it('removes the live image while hidden and reconnects it on return', () => {
+    const hidden = spyOnProperty(document, 'hidden', 'get').and.returnValue(false);
+    agentService.recordingPlaybackStatus.set('live');
+    fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('img.live-screen-img')).not.toBeNull();
+
+    hidden.and.returnValue(true);
+    document.dispatchEvent(new Event('visibilitychange'));
+    fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('img.live-screen-img')).toBeNull();
+
+    hidden.and.returnValue(false);
+    document.dispatchEvent(new Event('visibilitychange'));
+    fixture.detectChanges();
+    expect(fixture.nativeElement.querySelector('img.live-screen-img')).not.toBeNull();
+    expect(component.liveStreamError()).toBeFalse();
+  });
+
   function playButton(): HTMLButtonElement {
     return fixture.nativeElement.querySelector('.play-btn');
   }