Release Notes Writer

When to invoke

• "Generate release notes for v3.2."
• "What's in this release? Group changes for the changelog."
• "Draft user-facing notes between v1.4.0 and main."

Inputs needed

1. Source — one of:
   • CSV / JSON of merged PRs (number, title, body, labels, author, url)
   • Two git refs (e.g. v1.4.0..HEAD) — uses git log
2. Audience — public (default; drops chore/internal) or internal (keeps everything).
3. Version + date.