In New Haven, Foster's is pretty accommodating (they will even do gluten-free birthday cake with advance warning), but there are knowledge gaps, last time we were there no one seemed to realize miso often (or perhaps always, depending on your view & the source of info) contains gluten.
Ibiza did a great job with warning when I was part of a group meal there this spring. They seem very aware of food issues, someone else at our table had a shellfish allergy but didn't realize until he sat down that it was an issue with the night's menu, they were able to make him a substitute course on the fly.
Cafe Istanbul- I ate cleanly there at a drop-in meal. The waitperson wasn't familiar with celiac but picked up very quickly & I felt comfortable.
A recent (July 30) post on
'Please Don't Pass the Nuts' blog said Clair's Corner Copia has a gluten-free menu.
Happy eating! I am semi-close by, in Fairfield.