Unfortunately, without a transcript or video recording of the AWS re:Invent 2025 session "Putting AI at the core of transformation (AIM427)", I am unable to provide a detailed summary as requested. The lack of source material makes it impossible for me to analyze the content and extract the key points, technical details, and business context. I apologize that I cannot generate the comprehensive Markdown summary you have asked for. If you are able to provide the actual video or transcript, I would be happy to review the material and create a detailed summary for you.