“We’ve got to finish the job, right?” When U.S. President Donald Trump made that remark at a rally in Kentucky back in March, the Iran war had barely begun. And with huge firepower at his command, he exuded confidence that the endgame would be a mere formality. The war, he told the crowd of supporters, had already been “won.” Yet 2 1/2 months on, Mr. Trump’s definition of “finishing the job” has fundamentally changed. Why We Wrote This As the United States and Iran move toward a peace deal, with the thorny nuclear issue apparently still unresolved, the “asymmetric nature” of the conflict is coming into sharper focus, our columnist notes. Despite this week’s familiar dissonance between hints of an imminent peace deal and a resumption of U.S. military strikes in Iran, the focus is no longer on achieving a definitive battlefield victory.…