NFR-0002 — Preserve accessible interaction

Constraint: The shopper journey shall remain keyboard-operable with visible focus, semantic headings and status messages, non-color-only state, and a WCAG 2.2 AA contrast target. Measurable target: Automated accessibility checks report no serious violations on catalog, cart, checkout, and confirmation routes; manual keyboard traversal completes each route without a trap. Scope: Storefront web and Features ESHOPV1-FT-1 through ESHOPV1-FT-4. Status: Proposed; implementation candidate. Verification: Automated route checks plus manual keyboard and screen-reader review. Evidence: UI/UX accessibility expectations exist; deployed route verification remains pending.