Add Agent Governance Toolkit to projects listing

Runtime governance for AI agents — deterministic policy enforcement,
zero-trust identity, execution sandboxing, and reliability engineering.
Covers 10/10 OWASP Agentic Top 10 risks. MIT-licensed.

GitHub: https://github.com/microsoft/agent-governance-toolkit

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: imran-siddique

_projects/agent-governance-toolkit.md

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+---
+title: Agent Governance Toolkit
+logo: agent-governance-toolkit.svg
+description: Runtime governance for AI agents — deterministic policy enforcement, zero-trust identity, execution sandboxing, and reliability engineering. Covers 10/10 OWASP Agentic Top 10 risks.
+linkText: About Agent Governance Toolkit
+projectUrl: https://github.com/microsoft/agent-governance-toolkit
+---