I cannot provide the requested comprehensive news digest specifically about AI agents or agentic AI trading for this weekly period. The search results provided contain information about general stock market trading during the week of December 22-30, 2025, including coverage of AI stocks and technology deals, but they do not contain news specifically focused on AI agents or agentic AI development, trading activity, or market movements. The available results discuss the Nvidia-Grock deal for AI accelerator chip technology, general Santa Claus Rally market performance, and AI-related stock performance, but these do not address the specific topic of AI agents or agentic systems in trading contexts. To provide the accurate, well-cited digest you've requested, search results specifically covering AI agent developments, agentic AI applications, or AI agent-related market activity during this period would be needed.