CJ Stroud truly exceeded expectations last fall as the then rookie quarterback led the once moribund Texans to a divisional title and the second round of the playoffs. So now what? The way Houston offensive coordinator Bobby Slowik tells it, the prep for the second year — and the predicted jump in Stroud’s game — is going to set the tone for the rest of his career. Slowik, who also is headed into his second season with the Texans, talked about Stroud’s career “trajectory” this week as Houston went through phase three of OTAs. “It is a really, really impactful year to me that really sets the tr…