—— AMD Strikes Landmark AI Deal With OpenAI; US Online Holiday Sales to Hit $253.4 Billion; AI Boom Spurs Bubble Fears; US Shutdown Threatens to Stall IPO Comeback; Trump to Impose 25% Tariff on Imported Medium and Heavy Trucks; Deloitte to Refund Part of Fee After AI-Generated Report Contained Errors; Aston Martin Cuts Outlook Again …