Kate Zambreno’s latest book, “To Write as if Already Dead,” examines the life and work of the late Hervé Guibert. Kate Zambreno’s latest book, “To Write as if Already Dead,” is a study of Guibert’s uncompromising novel. In it, she wrote, “Every book I’ve published embarrasses me.” After almost a decade under contract, “Drifts,” about writing and Rainer Maria Rilke, …