Production is containerized. CI is containerized. The dev loop — where we actually spend our hours — usually isn't. CodingBooth is the missing piece. The three pains If you hop between projects, you've probably collected all three: Project residue. Every project installs something — a JDK, a Go toolchain, a DB client, an SDK. After a few months the host is a graveyard of half-configured runtimes, and two unrelated projects end up fighting over a broken global. Legacy projects punish you. The bigger and older the project, the harder it is to set up the same way as the rest of the team. The onboarding doc is stale, the setup script worked on someone's 2019 laptop, and the "just works" build tool version isn't published anywhere obvious. AI-assisted drift. Coding assistants happily suggest brew install this or go install that@latest while solving something small. Unless someone is watching closely, those land on your host permanently.…