Jyan Isaac Horwitz, 19, developed his skills as a baker at Gjusta. Jyan Isaac Horwitz used to start his day early, waking before sunrise to ensure he’d arrive on time at Gjusta, the popular Venice deli-bakery-coffee bar-lunch spot where he worked full time baking bread. “He needed to be working with his hands and fully immersed in something.” Jyan Isaac …