Write a Pull Request Description From a Diff

    Write a pull request description for the change below.

Diff (or a summary of the commits and changes):
{{diff}}

Context (optional — the issue it addresses, why now): {{context}}

Structure it as:
- **Summary** — what this PR does, in one or two sentences.
- **Why** — the motivation or problem it solves.
- **What changed** — the key changes as a short bulleted list (grouped if it touches several areas).
- **How to test** — concrete steps or commands a reviewer can run to verify it.
- **Risks / notes** — anything a reviewer should watch for (migrations, breaking changes, follow-ups).

Keep it scannable and honest — describe what the diff actually does, and flag anything that looks unrelated or risky rather than glossing over it. Omit a section if the change genuinely doesn't need it.