A recap of five major AI-adjacent Hacker News stories, covering an educational GPU-building game, Microsoft's sprawling Copilot branding, Nvidia eGPU compute support on Arm Macs, Claude Code surfacing a long-hidden Linux bug, and a deep look at what actually makes coding agents work in practice. The episode tracks the debates on usability, branding overload, hardware access, security validation, and whether the harness matters more than the model.