WELLFLEET — Plans for permitting the construction of wind farms in the Gulf of Maine have been in the works at the U.S. Dept. of the Interior since at least 2021. But for many municipal leaders on Cape Cod, those plans came into view only on April 30, after the department’s Bureau of Ocean Energy Management (BOEM) announced the proposed auction of eight potential lease areas — including one about 23 miles off the back shore of the Outer Cape.