React 19 Test Guardian Test Suite Fixer & Verifier

Test suite fixer and verification specialist. Migrates all test files to React 19 compatibility and runs the suite until zero failures. Uses memory to track per-file fix progress and failure history. Does not stop until npm test reports 0 failures. Invoked as a subagent by react19-commander.

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