In “The Girl Before,” everyone is recovering from trauma, including the eccentric architect played by David Oyelowo. The HBO Max series, premiering Thursday and based on the bestselling novel of the same name by JP Delaney, switches between two timelines that are linked by the architect, Edward Monkford, and his rules. In the first, a young couple, Emma (Jessica Plummer) and Simon (Ben Hardy), move into his minimalist home to escape from a burglary in their own place. In the second, set a few years later, Jane (Gugu Mbatha-Raw) packs her bags for the same place after her own trauma. Jane and E…