NEW YORK — “I have decided,” President Donald Trump declared Wednesday, announcing he’d reached a verdict on the Iran nuclear deal’s future even as top U.S. and Iranian officials headed into their highest-level talks of his presidency. Iran’s leader, meanwhile, lashed out at “ignorant, absurd and hateful rhetoric” in response to Trump’s blistering attack at the U.N. The jabbing between Trump and Iran’s President Hassan Rouhani set the stage for a contentious meeting of the nuclear accord’s parties.