Michigan coach Jim Harbaugh has agreed to five-year contract that runs through the 2026 season, the school announced Wednesday. The contract alters the terms and length of the deal signed last January by an additional season. The contract adds one year to the extension signed last January, but financial details were not released. Harbaugh had a brief flirtation with the NFL, and after not being offered the Minnesota Vikings head coaching position when he flew there for an interview Feb. 2, Harbaugh returned to Michigan to coach his eighth season. The 58-year-old coach led Michigan to a 12-2 se…