Microsoft’s latest Copilot push turns Windows 11 from an assistant you talk to into an assistant that can look, act, and — with permission — work directly on files stored on your PC, a step that broadens the scope of on‑device AI while raising new questions about privacy, security, and reliability for everyday users and IT teams. In a staged rollout that mixes public releases, Windows Insider previews, and private betas, Microsoft is adding a system wake word (“Hey Copilot”), expanding...