Mohammad Heydarian, an Iranian contractor, still has work finishing off a single-family home. But things look bleak after that, he said. He has already fired his workers, and is struggling to make ends meet, providing for his wife and two teenage children. “My life became a fight trying to prevent regression, but I lost,” said Mr. Heydarian, 46. For more than a year, President Hassan Rouhani has been dangling the prospect of a bright economic future before the middle classes that elected him, promising to complete a deal with the West to limit Iran’s nuclear program and end the sanctions hobbling the Iranian economy. While the deadline of Nov. 24 is fast approaching, it is far from clear whether the two camps will agree on a pact. What seems certain, analysts say, is that with oil prices falling seemingly daily — and projected to drop even further […]