The Iran war has made life even more precarious for millions of foreign workers in the Middle East. They have helped build the Gulf Arab states’ modern, oil-fueled economies — with many not fully sharing in their prosperity. At least 28 were killed in missile and drone attacks before a fragile ceasefire took effect in early April. Now they face an even sharper version of a long-standing dilemma, whether to keep working in the Gulf Arab countries, where wages are much higher — hoping that the truce endures — or return home, to their already poor countries where prices have soared because of the conflict.