React 19 Migrator Source Code Migration Engine

Source code migration engine. Rewrites every deprecated React pattern to React 19 APIs - forwardRef, defaultProps, ReactDOM.render, legacy context, string refs, useRef(). Uses memory to checkpoint progress per file. Never touches test files. Returns zero-deprecated-pattern confirmation to commander.

Source: github.com/github/awesome-copilot/blob/main/agents/react19-migrator.agent.md · License: MIT