Wall Street's record-setting start to the week ran into two familiar sources of volatility: the artificial intelligence trade and oil. The Dow Jones Industrial Average on Monday closed above 53,000 for the first time ever before renewed U.S.-Iran tensions erased those gains, leaving the blue-chip index down 0.5% for the week. Chip stocks — once the hottest corner of the market — also swung sharply as investors continued to question whether the AI trade had become overextended. Even so, the tech-heavy Nasdaq gained 1.74% for the week, while the S & P 500 rose 1.23%. Both indexes have finished higher…