With the leaves turning and the mayoral race down to its final paces, William C. Thompson Jr., the Democratic candidate, sketched out a liberal policy agenda Friday, saying he would fight to repeal laws that allow landlords to charge market rents for regulated apartments. He promised to appoint pro-tenant members to the Rent Guidelines Board to oppose higher rents and pro-rider members to the board of the Metropolitan Transportation Authority to oppose raising fares. He said he would keep subway station agents on the job, and try to place all rent-regulated middle-class apartments that are part of the Mitchell-Lama program...