Contract negotiations between the Belmont Public Schools (BPS) and the Belmont Education Association (BEA) are set to resume March 9 under state mediation, just over a month after the BEA voted to move to a work-to-rule job action. “I think that it’s helpful to be able to ask for help. I think as adults we try to model that for our students,” said School Committee Chair Meghan Moriarty. “When you’re stuck, sometimes you need help from a third party, so…