regression-test-generator

Use when a verified fix needs a regression test — "write a test for this fix," "generate regression test," or "add test coverage for this bug." Auto-detects project test conventions, routes to Vitest+RTL or Playwright based on component type (sync vs async server), generates targeted tests with anti-brittleness constraints, and annotates coverage boundaries. Not for diagnosing bugs, applying fixes, or writing feature tests — use ui-bug-investigator, component-fix-and-verify, or manual test authoring respectively.