I live here, but I'm allergic to too much and I don't eat out.
I can ask around.
There aren't any chain restaurants on the Downtown Mall, except for maybe a yogurt place. The Five Guys closed. Lots of local places, though. There's a local pizza place (by the slice), Christian's, that was peanut/shellfish free the last time I ate there, but that was over a decade ago. And Just Curry (lunch place) might be okay. I had to stop eating there because the owner switched oils when they re-opened after a hiatus. The owner will readily tell you anything/everything in the food, though.
I have multiple food allergies, so I don't pay attention to new restaurants, sadly. I'm sure there are a couple places that could easily accommodate, but I'm kinda clueless. Looks like the new pie place does both shrimp *and* peanut butter.
Out on 29 in the new Stonefield shopping center, there's a restaurant that is supposed to accommodate anything. It's a chain from up your way, though, Burton's Grill. And they do serve calimari and crabcakes, I see. I haven't called them to see if they feel like being challenged. :p