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core/offers module against docs/backend/PHASE-3-CATALOG-OFFER-FULFILLMENT- CONTRACT.md §2-3, §7. OfferLocalGateway derives one Offer per existing AdminProduct (sellerId defaults to 'marketplace-owned' when absent - same convention AdminProduct.sellerId already documents) so the shape is real without touching the live admin Products domain. Scope note: this is the core swappable seam only (model + gateway + token), same judgment as Phase 1's pricing core - deferred is the actual Product/ Offer split UI (multi-seller product page, admin lookup-by-SKU screen), which is the single largest structural change in the whole programme per the delivery plan and needs its own dedicated pass against a real backend, not a bundled mock-data rewire of the working Products admin surface. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>