Michigan coach Jim Harbaugh, who in the last eight days has led the Wolverines to a national championship and interviewed for an NFL head-coaching job, continues to have his representatives negotiate with Michigan for a contract extension that would make him the nation’s highest-paid college coach. The latest draft of the six-year extension that would pay Harbaugh $11.5 million annually plus incentives was received by Michigan last Friday and includes unique language regarding termination and delaying the starting date of the contract to accommodate the NFL hiring window. The details of the co…