China’s ruling Communist Party ended a key four-day meeting of top leaders on Thursday, state-run media said, with the world’s second-largest economy set to unveil its mid- to long-term economic policies amid challenges including a prolonged property sector crisis and population decline. The third plenary session of the 20th Central Committee, which brings together about 200 top party officials and 170 alternate members, is set to release the outcome of the closed-door gathering in a communique. On the first day of the conclave, leader Xi Jinping delivered a work report and explained a draft d…