WASHINGTON — U.S. Capitol Police Chief J. Thomas Manger sought to ease concerns from the lawmakers in charge of his agency’s budget on Wednesday, saying the department is preparing for major upcoming events — including another potential Jan. 6 — by trying to grow the size of its force and overhauling its intelligence gathering activities. During an hour-long hearing in front of the House Appropriations Legislative Branch Subcommittee, Manger argued the agency is far better positioned than in the past to address the safety of members both in the Capitol complex and at their residences, though a…