Explain PR — explain a PR/MR in plain language
Turn a freshly created Pull Request / Merge Request into a clear, friendly explanation the user can read in one pass to understand what changed, why it was done, and how it works — with the relevant code shown inline.
This replaces the manual prompt a user would otherwise type ("explain what you did, why, and how, in simple terms, with the relevant code"). The point is that the user shouldn't have to ask: once a PR/MR exists, they
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