China’s Communist Party is preparing to set in regulatory stone the boundaries of various commissions and groups under its top decision-making Central Committee, with new rules clarifying their often nebulous responsibilities.The rules were reviewed by the party’s top echelon, the 24-member Politburo, on Monday in a meeting chaired by President Xi Jinping, state news agency Xinhua reported.The report did not spell out the regulations but did say they were meant to standardise the policy...