SKUs subject to manufacturer Minimum Advertised Price (MAP) agreements (e.g. Wholesale Marine Import). These products are EXCLUDED from all Boat Suppliers Wholesale Pro tier discounts and ship at full retail to honor MAP. This collection is the source of truth for the wholesale MAP carve-out: tier discounts EXCLUDE this collection and no wholesale discount rule targets it. Membership is reconciled from data/boat-suppliers/wholesale/map-skus.json by src/scripts/wholesale-build-map-collection.ts.