The street-side wall of the Grandi Building in Point Reyes Station became the epicenter of a community art snafu last week after a painter involved in a town-wide exhibit covered over an older mural of waves—to the horror of the building’s manager. Wyatt Hersey, a 29-year-old Chico resident, began working on his piece last Tuesday, having coordinated with the show’s curator, Isis Hockenos. Her show, “Atlas of Decivilization,” is part of the Geography of Hope…