learn-from-pr

Use this skill when the user asks to learn from a pull request, understand a PR or branch change, get an explainer or architecture overview of the code a PR touches, or invokes /learn-from-pr. It writes one short HTML learning document: why the PR exists, a before-and-after comparison, a component diagram of the touched code and its neighbors, and a map from each changed file to a component. A learner profile controls format and length, and the user can override it. It does not review, gate, quiz, or comment on the PR.