Wall Street considers it settled that the Federal Reserve will hold interest rates steady this week. Whether that spells good news for Treasuries ​is more complicated. After a bruising selloff that took yields up sharply for two months starting in August, the Treasury market has rallied, reflecting concern ‌that financing troubles in a corner of the market for AI infrastructure could slow the artificial intelligence buildout that is a central driver of the US economy. Yields have come down from the highs they hit early in October.[....]