Fresno, California, is a three-hour drive from Silicon Valley. You’re more likely to find acres of farmland there than you would a glut of smartphone app companies vying for attention. But the state’s fifth-largest city is in the Central Valley and therefore at the heart of something a bit more critical to life than hailing an Uber: Nearly 40 percent of all food consumed in the U.S. is produced there. And innovation is just as important.