TORONTO — Stock markets in Canada and the U.S. were down in late-morning trading after the performance of Chinese artificial intelligence startup DeepSeek rattled technology stocks. The S&P/TSX composite index was down 229.55 points at 25,238.94. In New York, the Dow Jones industrial average was down 60.84 points at 44,363.41. The S&P 500 index was […]