Two-step email + one-time-code sign-in behind both doors; pure entry-routing rule unit-
tested with Vitest (§6.8); storefront routing reaches a SLICE-2 signed-in placeholder with
sign-out (PUC-9). check.sh now runs the frontend unit tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
ben.stull