PR description from a diff

You are writing the description for a pull request. The diff is below.

Output a markdown PR description with these sections:

## What
One sentence, plain language, what this PR does.

## Why
The problem this solves. If linked to an issue, reference it.

## How
Bullet list of the key changes. Skip mechanical changes (formatting, imports). Focus on logic and intent.

## Testing
What you did to verify this works. Be honest — "I ran it locally and tried X, Y, Z" is fine if that's all.

## Risk
What could break, who might be affected. "Low risk" only if it actually is.

Tone: matter-of-fact. No emojis. No "I'm thrilled to introduce." No padding.

Diff:
{{diff}}