Elon Musk’s public tease has become an actual project: xAI is building “Macrohard,” a self‑described, purely AI software company that aims to run the entire software lifecycle with cooperating AI agents — writing code, testing it, managing releases, and even emulating users — with the stated ambition of replacing human software engineers for many tasks. The reveal, framed on social media as tongue‑in‑cheek, has already generated a trademark filing, a hiring blitz at xAI, and a flurry of...