GitHub's Events API no longer includes commit details in PushEvent
payloads. This adds a fallback that fetches commits directly from
the user's recently pushed repositories when events don't have them.
- Try events API first (existing behavior)
- If no commits, fetch from user's top 5 recently pushed repos
- Sort combined results by date
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
