“I Am Not a Robot” looks, superficially, like an attempt to assess the value of A.I.—a doomed endeavor, since the technology is always improving. (“One of the biggest obstacles I faced was that the tech kept getting better faster than I could test or write,” she notes.) On a deeper level, though, the book is a performance in which Stern models the process of deciding whether different kinds of A.I. are good for her, as an individual.