Onboards a project for use with Claude + OMC by producing a comprehensive CLAUDE.md through codebase exploration, Socratic requirement gathering, and autonomous execution. Trigger on: "onboard this project", "set up Claude for this repo", "create a CLAUDE.md", "help Claude understand this codebase", "onboard for claude", "onboard for oh-my-claudecode". Don't use when a CLAUDE.md already exists and the user wants to update it — use direct editing instead.