Introduces the wcag2a/wcag2aa E2E suite from the test-suite branch with
the color-contrast rule active — no disableRules exclusion. Also adds
/coverage/ to .prettierignore so generated lcov reports don't fail the
lint hook.
This commit intentionally fails the axe suite until the contrast fixes
land in the next commits.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
