TAHOE CITY, Calif. – When owner Annie Stefani was brainstorming the name of her bookstore in Tahoe City, she didn’t have to think too hard. “I wish I could take more credit,” she expressed, “but it pretty much just named itself.” The Understory opened this summer with a name that nods to the literary concept of a story beneath a story. The store’s partially underground location, in front of the Urgent Care and Trading Post Shopping Center, also …