vweevers/hallmark — reverse-engineered prompt

Build me a small Node.js command line tool called hallmark that keeps Markdown files tidy with almost no setup.

I want someone to be able to run hallmark in a git repo and get clear lint warnings for Markdown style problems, then run hallmark fix to automatically rewrite files in place. It should look at normal Markdown files by default, accept custom files or globs, respect git ignored files, and allow extra ignore patterns. The formatter should clean up common Markdown style issues like bullets, emphasis, strong text, code fences, tables, blockquotes, spacing, final newlines, literal links, duplicate or missing link definitions, and broken internal links.

Please also add the helpful GitHub touches from the README, like linking issue numbers, pull requests, and usernames when fixing. Include a changelog helper command that can add a new release entry to CHANGELOG.md using a version bump or a specific semver version.

Use remark or related current libraries if that makes sense, and look up docs online if needed.