I've built a CLI tool that stores project management data (issues, milestones, logs) as plain markdown files with YAML frontmatter in a .mdp/ directory. No database, no server, just files on disk that work with git.

The main use case is giving AI coding agents a structured way to track their own work. The CLI is fully non-interactive (all input via flags/stdin, JSON output), so agents can create issues, update statuses, log progress, and check milestone completion programmatically.