Foundry Agent Service GA + Open Agentic Stack + Deployment Tools

Agent Service GA with open-sourced governance toolkit. Assistants API dies Aug 26. MAI-Thinking-1 in Foundry preview. MagenticLite demo shows small-model agentic experience. New: Foundry Local getting started guide published—practical deep-dive for running Phi-4, Qwen, DeepSeek-R1 locally.