Grief and trauma are often so unbearable, so emotionally devastating, to survive, sometimes one has to escape reality and transform life into a… stylized situation comedy coping mechanism. That appears to be the linear way of explaining Marvel Studios’ “WandaVision,” a new romantic comedy mystery limited-series about loss, mental fragility, and anguish—the first of its kind for Disney+, in what promises to be a long line of further-connected Marvel storytelling.