Portland’s bakery scene just got a little sweeter. And that’s saying something in a city where—impressively—just about every district has its own oven-fresh trophies. What distinguishes St. Jack (2039 SE Clinton St) is its intimacy, the way it blends the art of sweet snacking and hanging out in a way that makes Portland the envy of the country. Walk through the dining room of this new restaurant-patisserie into a tiny space dominated by a cozy...