core/cart against docs/backend/PHASE-6-CART-CHECKOUT-CONTRACT.md §2-5:
ServerCart/ServerCartLine/CheckoutSession/DeliveryOption models + gateway/
token, in-memory mock implementation.
Deliberately does not touch pages/cart/cart.component.ts or
services/cart.service.ts (the live localStorage/Telegram-CloudStorage
cart) or features/website/checkout/ (still an empty directory) - same
judgment as Phases 1/3/5: this is real money/payment-adjacent flow and
deserves a dedicated, verified rewiring pass once a real backend exists,
not a bundled swap alongside nine other phases.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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