Wire the Layered Checkout

Challenge on lesson: Checkpoint — The Layered Checkout

CHALLENGE

Difficulty: intermediate+25 XP

Implement ICatalog/IBasket ports with MemCatalog/MemBasket adapters, the Checkout service (interface-only Quote with an empty-basket guard), and dedup-then-map QuoteMany.

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Back to lesson: Checkpoint — The Layered Checkout