The world's top central bankers are gathering in Sintra, Portugal, for the ECB Annual Conference — and the mood music is anything but harmonious. Fed Chair Kevin Warsh joins ECB President Christine Lagarde, BOE Governor Andrew Bailey and BOC Governor Tiff Macklem for Wednesday's marquee panel against a backdrop the Bank for International Settlements just called a potential systemic crisis in the making. The BIS warned that AI's capex boom risks repeating the...