There are two ways that writers on the internet announce career changes: either by tweeting about how they found out they got laid off, or by publishing a grandiloquent “farewell post.” You know the type: endlessly generous, ruminative, peppered with musings on the industry and hyperlinks to the writer’s greatest hits. It is a way to assemble a legacy. “Stay tuned for my next adventure!” these posts conclude, shared on Twitter with “CRYING” or “THIS WAS DIFFICULT” or “Announcement!” It is a grand exercise in personal branding, writ in humblebraggery, and it is for herbs. Today, though, is my last…