docs: add Microsoft Agent Lightning to projects (#17422)

Add Agent Lightning, Microsoft's open-source framework for training
AI agents with RL, APO, and SFT. Uses LiteLLM Proxy for LLM routing
and trace collection.

docs/my-website/docs/projects/Agent Lightning.md

@@ -0,0 +1,10 @@
+
+# Agent Lightning
+
+[Agent Lightning](https://github.com/microsoft/agent-lightning) is Microsoft's open-source framework for training and optimizing AI agents with Reinforcement Learning, Automatic Prompt Optimization, and Supervised Fine-tuning — with almost zero code changes.
+
+It works with any agent framework including LangChain, OpenAI Agents SDK, AutoGen, and CrewAI. Agent Lightning uses LiteLLM Proxy under the hood to route LLM requests and collect traces that power its training algorithms.
+
+- [GitHub](https://github.com/microsoft/agent-lightning)
+- [Docs](https://microsoft.github.io/agent-lightning/)
+- [arXiv Paper](https://arxiv.org/abs/2508.03680)

docs/my-website/sidebars.js

@@ -826,6 +826,7 @@ const sidebars = {
             "projects/mini-swe-agent",
             "projects/openai-agents",
             "projects/Google ADK",
+            "projects/Agent Lightning",
             "projects/Harbor",
             "projects/Docq.AI",
             "projects/PDL",