The Biden administration and state officials are bracing for a great unwinding: millions of people losing their Medicaid benefits when the pandemic health emergency ends. Some might sign up for different insurance. Many others are bound to get lost in the transition. State Medicaid agencies for months have been preparing for the end of a federal mandate that anyone enrolled in Medicaid cannot lose coverage during the pandemic. Before the public health crisis, states regularly reviewed whether people still qualified for the safety-net program, based on their income or perhaps their age or disab…