BNN Bloomberg is Canada’s definitive source for business news dedicated exclusively to helping Canadians invest and build their businesses. BANGKOK — South Korea’s Kospi index jumped nearly 18 per cent on Friday, tracking gains on Wall Street as artificial intelligence-related stocks bounced back after losses earlier this week.U.S. futures edged 0.5 per cent higher and oil prices slipped more than one per cent.The Kospi surged at the open and then wavered, eventually rocketing up 17.9 per cent to 6,695.45, its largest single day gain ever. Shares of South Korean technology giant Samsung Electronics surged 28 per cent, while memory chipmaker…