For more than 20 years, New York City schools have operated under a simple idea: If one person is in charge, one person is accountable.  Now mayoral frontrunner Zohran Mamdani wants to break that link . Mayoral control works the same way any strong organization works, with clear leadership. When one person is ultimately responsible for a sprawling entity like the city Department of Education, with its 815,000 students and 1,600 schools, decisions move faster, reforms can be evaluated and voters