Greptile Summary

Fixed oxfmt formatting issues in CONTRIBUTING.md that were causing CI failures on all PRs. The changes remove a trailing blank line and escape an underscore character to comply with the repository's formatting requirements.

• Removed trailing whitespace after Jonathan Taylor's contributor entry
• Escaped underscore in Josh Lehman's X handle (@jlehman\_) to ensure proper markdown rendering

The author verified the fix locally with npx oxfmt --check CONTRIBUTING.md. These are purely formatting changes with no impact on content or functionality.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The changes are minimal, formatting-only, and verified to pass the formatter check locally. No logic, content, or functional changes were made.
• No files require special attention

_{Last reviewed commit: dcd4db3}