Given any Git repository — a GitHub URL, an org/repo slug, a local path on disk, or the repo you're already inside — get productive fast and land a mergeable commit. Clone/orient, get the build+test loop green, extract the contribution rules that gate a PR, map the 20% of the code you'll touch, locate the change site, and lay out the shortest path to a passing commit. Use when the user points at a repo (remote or local) and wants to "onboard", "get productive", "start contributing", "make my first commit", "ship a change", or "get set up to work in this codebase".