rule-porter: Convert Cursor rules to CLAUDE.md, AGENTS.md, and Copilot

This is a submission for the DEV Weekend Challenge: Community The Community Cursor AI users who also use Claude Code, GitHub Copilot, or any combination of AI coding tools. Right now, if you've invested time writing good .mdc rules in Cursor, those rules are locked in. Cursor uses its own format with YAML frontmatter, glob patterns, and alwaysApply flags. None of that translates to Claude Code's CLAUDE.md , Copilot's .github/copilot-instructions.md , or the AGENTS.md format. People switching between tools (or using more than one) have to manually rewrite everything. I know because someone told me so directly. Matthew Hou left a comment on my cursor-doctor launch post asking: Have you thought about an export/convert feature? Something that could take validated Cursor rules and output an equivalent AGENTS.md or CLAUDE.md? That comment kicked this off. What I Built rule-porter is a zero-dependency CLI that reads your .cursor/rules/ directory and converts every .mdc file into the format yo