Show HN: Skill to annotate any Markdown file for AI feedback

Plannotator natively integrates with coding agent plan modes via hooks. The core feature set is the ability to annotate plans throughout the planning mode process. Users submitted a feature request to be able to annotate any file. This is what that does. More on how Plannotator works in the video demo here: https://www.youtube.com/watch?v=a_AT7cEN_9I https://www.youtube.com/watch?v=a_AT7cEN_9I