And a lot of people here are availing themselves of D.C.’s unique decriminalization rules. Microdosing mushrooms as a kind of performance-enhancing brain boost — already wildly popular among the California tech set — is now fairly common in Washington, especially in media circles. Recreational use — macrodosing? — isn’t all that uncommon either. If you want a fully legal psychedelic experience, you can stop by Field Trip, on 15th…