WASHINGTON — Iran is taking advantage of the ceasefire with the U.S. to dig out its weapons, according to a U.S. official and two other people familiar with the matter. The regime has stepped up its efforts to excavate missiles and other munitions it hid underground or that were buried beneath rubble from U.S. and Israeli airstrikes, they said. The U.S. believes the regime wants to quickly reconstitute its drone and missile capabilities so it could launch attacks across the Middle East if