Boston — The words emanating from Gov. Mitt Romney’s mouth on Wednesday conveyed he was not running for re-election next year. Yet the theatrics at his State House news conference portrayed him as a presidential contender. From the dual banks of lights erected at stage right and stage left, to the new $2,500 podium shaped like the one President Bush often uses in the Rose Garden, Romney’s staff left no detail to chance as he ended one phase of his politicalcareer — and potentially opened another