Every city is special in some way to the people who call it home, but as author Gary Kamiya writes, San Francisco is a more potent touchstone than most thanks to the unique place it occupies in the American imagination. In the new anthology “The End of the Golden Gate,” writers including W. Kamau Bell, Margaret Cho and Michelle Tea reflect on a city in flux. Kamiya and writer and artist John Law talk about gentrification, rents and the message newcomers often hear that San Francisco peaked just before their arrival.