pr-explainer

name: pr-explainer
description: Generate a shareable walkthrough artifact for a pull request — what changed, why, and a reviewer-oriented before/after narrative.

No PR number was given — explain the current branch's pending PR:

1. git log --oneline @{upstream}..HEAD for the commit list (fall back to origin/main..HEAD if no upstream)
2. git diff @{upstream}...HEAD for the unified diff

Goal

Produce a shareable PR walkthrough artifact — a self-contained HTML page a
reviewer can read before opening the diff to understand what this change does,
why it's being made, and where to focus attention. Pitch the writing at a
reviewer seeing this PR for the first time.

Wherever the answers end up in the sections below, the page must answer all
five of these questions: