President Obama on Friday appointed longtime White House aide Kristie Canegallo as deputy chief of staff for policy implementation, to oversee issues that include the continuing rollout of the Affordable Care Act and better integration of technology in classrooms. The move, which comes three days before senior White House health-care adviser Phil Schiliro will step down, aims to institutionalize some of the changes chief of staff Denis McDonough made in the wake of the health-care law’s botched debut last fall. [....] Unlike many of Obama’s top advisers, who came to their jobs through politics, Canegallo started as a civilian Pentagon...