A millennial engineer dreamed of a walkable small town with big-city vibrancy. So, she's building it herself

Edge Esmeralda, pictured above, is a pop-up retreat that represents what the future town of Esmeralda hopes to be. Devon Zuegel/Edge Esmeralda Devon Zuegel, a San Francisco tech worker, longed to live in more of a community. She is building Esmeralda, a small city in Sonoma Wine Country. She hosts…