One of Gov. Ned Lamont’s highest-profile recruits from the private sector, Ryan Drajewicz, is leaving the administration after 13 months as the governor’s chief of staff, a long-rumored departure resulting in a reshuffling of two other appointees, Paul Mounds and Josh Geballe. Mounds, the chief operating officer and deputy chief of staff, succeeds Drajewicz, giving the governor a top aide with a deeper well of political contacts inside the State Capitol. Geballe, a former IBM executive who has been tasked with reorganizing and modernizing government as commissioner of administrative services, will continue that project as the commissioner and the state’s chief operating officer. “Paul, as you all know, he knows the building, and the building knows him,” Lamont said. “And if I’ve learned one thing, this is a building that really runs on relationships.”