Cart upsell candidates
Feeds the cart's free-delivery tile: when a shopper is short of the free-delivery threshold, the cart offers the one item here that closes the gap.
Entries are variants, not products. A bottle appears once per format, so the cart offers "35 cl at CHF 45.00" rather than guessing between five prices.
Order does not matter — the theme sorts by price. Do not spend time reordering this collection by hand.
A member may be temporarily out of stock; the cart simply skips it and offers the next candidate. No need to remove and re-add it.
Deliberately excludes 70 cl, 75 cl and 100 cl formats: pushing a full bottle to earn free postage is the most expensive outcome for the shop in real shipping cost.
