The promise of a chatbot that can write and fix code has attracted repeat investments in a six-month-old startup—even after it appeared to flub its product launch.Founders Fund has led a $175 million investment in Cognition, a startup that recently launched an artificial intelligence–powered coding assistant called Devin, according to an investor who reviewed terms of the deal. The venture firm valued the startup at $2 billion, including the new money, the investor said. Just a month earlier, Fo...