“Blessed are the peacemakers,” says the good book, and by that measure Jared Kushner, the real estate scion and presidential son-in-law and senior adviser, has an overflowing cup, to borrow the psalmist’s parlance. An architect of the agreements between Israel and Arab countries won by President Trump and known as the Abraham Accords, Mr. Kushner should be on the shortlist for an invitation from the Storting.