Create fundamental-ai.md for AI research overview

Added foundational AI research documentation outlining themes and focus areas.

Author: vishwaparekh

research/fundamental-ai.md

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+layout: default
+title: Fundamental AI
+---
+
+## Fundamental AI Research
+
+We develop the AI foundations needed to understand complex human and biological systems.  
+This vertical focuses on how models learn safely, robustly, and collaboratively over time.
+
+Our current efforts are organized into two themes:
+
+- **AI Safety & Trustworthiness** – bias, uncertainty, robustness, demographic leakage, and secure behavior.
+- **Human–AI Ecosystems** – multi-agent intelligence, lifelong learning, and experience sharing (SheLL).
+
+You can explore each theme in more detail below.
+
+- [AI Safety »]({{ '/research/ai-safety/' | relative_url }})
+- [Human–AI Ecosystems »]({{ '/research/human-ai-ecosystems/' | relative_url }})