There are lots of ways to make sophisticated and delicious chicken salad. This is not one of those ways. This is problem-solving: It is morning, and you need to pack a lunch off to school or camp, and the school or camp is peanut-free. Luckily, for these purposes, this is the kind of week where you’re already falling behind, so dinner last night was a store-bought roast chicken. The carcass is in the fridge.