React19 Upgrade

Imported from github/awesome-copilot (MIT, commit 613efc8). This plugin was written by its upstream authors and has not been reviewed by AI Development Hub. See the bundled LICENSE.

Enterprise React 19 migration toolkit with specialized agents and skills for upgrading React 18 codebases to React 19. Includes auditor, dependency surgeon, source code migrator, and test guardian. Handles removal of deprecated APIs including ReactDOM.render, forwardRef, defaultProps, legacy context, string refs, and more.

Installing this plugin installs:

• 5 agents: awesome-copilot/react19-auditor, awesome-copilot/react19-commander, awesome-copilot/react19-dep-surgeon, awesome-copilot/react19-migrator, awesome-copilot/react19-test-guardian
• 3 skills: awesome-copilot/react19-concurrent-patterns, awesome-copilot/react19-source-patterns, awesome-copilot/react19-test-patterns