Story files are excluded from vitest by design (they run in Storybook
runner, not vitest). Add *.stories.{ts,tsx} to ALLOWED_GLOBS so the
L1 diff gate doesn't flag them as "new untested file".
Also add error-handling test for useOptionalConsent rethrow path
(cookie-consent-banner lines 52-53) achieving 100% statement coverage.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>