Boris Cherny runs Claude Code at Anthropic. He just told CNBC that six months ago he stopped writing code by hand. He prompts Claude, Claude builds the feature, Claude writes the tests, Boris reviews and asks for changes. That workflow describes the easiest quintile of senior engineering work. It runs on greenfield feature tickets. Spec is clear, repo is clean, the change is local. Typing used to be the bottleneck. The model cleared that bar in late 2025, right around the time Claude Code…