Expectations of change at the top of Iran’s Islamic Republic are growing as nationwide protests over surging living costs unite an unusually broad swathe of society – from pro-regime merchants and the conservative rural poor to the cosmopolitan urban middle class – for the first time since the 1979 revolution. Fuelled by the rial’s dramatic collapse following Iran’s 12-day conflict with Israel and the United States in June, the unrest has become a lightning rod for public anger at corruption,...