After six years of development, Grass Valley’s senior cohousing complex Wolf Creek Lodge opened Saturday, the day after the residents obtained their certificates of occupancy. “Members are ready to move in starting this month,” resident Suzanne Marriott said in an email to The Union. Cohousing is an intentional community of private residences that share common areas. There are hundreds of them across the country, but Wolf Creek is one of only a handful of senior cohousing communities nationwide, said Kathryn McCamant, the developer and project manager, during a tour of the facility in late September. Construction on the $11.2 million …