STAMFORD — Changes are in motion for the city’s public schools. While the Board of Education remains largely the same, and new president David Mannis is adamant about picking up where former president Geoff Alswanger left off, the central office is abuzz with shifts in leadership positions and an incoming strategic plan that will shape the district’s goals in the coming years. The plan, according to Superintendent of Schools Earl Kim, is a blueprint for the district going forward, built with input from staff across the schools.