For about a month, I did the dumbest thing in my dev career: I carried an open laptop around my apartment like a newborn. I'd kick off a long Claude Code run — a refactor, a test suite, a migration — and then I couldn't close the lid. Close the lid, the machine sleeps, the session dies, the context is gone. So the laptop came with me. To the kitchen. To the couch. Balanced on the arm of a chair at dinner. There had to be something better than "keep the MacBook awake forever." It turns out ...