What’s next for Windows and Surface without Panos Panay? The Surface Pro 9. | Photo by Amelia Holowaty Krales / The VergePanos Panay has always been the force behind Microsoft’s Surface line. He helped bring Surface to life as a secret project more than 10 years ago. He’s presented the new devices onstage at events, showed up at malls to promote Surface hardware, and has steered Microsoft’s Surface ta…