Americans would no longer have to worry about medical debts dragging down their credit scores under federal regulations proposed Tuesday by the Consumer Financial Protection Bureau. If enacted, the rules would dramatically expand protections for tens of millions of Americans burdened by medical bills they can’t afford. The regulations would also fulfill a pledge by the Biden administration to address the scourge of health care debt, a uniquely American problem that touches an estimated 100 million people, forcing many to make sacrifices such as limiting food, clothing, and other essentials. “N…