We stayed at BC CL. Two of my kids are allergic to peanuts, tree nuts and shellfish. I informed Special Diets and they passed the info on the the CL manager. He called me the day before our trip and told me to call the room service chef when we arrived, since he handled the CL food. When I called, the chef was clueless, so we realized we were pretty much on our own. Asking the lounge staff wasn't helpful. They rarely knew ingredient info of the appetizers and didn't understand the notion of cross-contamination. The kids stuck to things we knew would be safe, like fruit loops or raisin bran, yogurt, and fruit in the mornings, and cheese, crackers, rye bread, and veggies for evening appetizers. Based on lots of Disney dining experiences, we knew to avoid the pastries. Fortunately, my kids were young enough not to be interested in the hot appetizers and salads, but missing out on the little cakes kind of bothered them. We bought a bunch of Divvies cookies and safe brownies from the gift shop and kept them on hand for treats. Stick to the things you know in the real world and your kids should be fine.
After our trip, I filled out a Disney survey and suggested an ingredient binder be kept in the lounge. It wouldn't be that hard to manage, because the offerings in the morning and afternoon snacks were always the same. The selection of evening appetizers and desserts was fairly limited. They seemed to be on a 3-day rotation schedule. It would be helpful, not only for the guests, but for the CMs who have to anwer questions.