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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>