DENVER — Suna Karabay touched up her eye makeup in the rearview mirror and leaned against the steering wheel of the bus to say her morning prayers. “Please, let me be patient,” she said. “Let me be generous and kind.” She walked through the bus to make her final inspection: floor swept, seats cleaned, handrails disinfected, gas tank full for another 10-hour shift on the city’s busiest commercial road. She drove to her first stop, waited until exactly 5:32 a.m., and opened the doors.