Add SECURITY.md and CODE_OF_CONDUCT.md

Add standard Microsoft community health files required by the open
source release checklist.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: rgregg-msft

CODE_OF_CONDUCT.md

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+# Microsoft Open Source Code of Conduct
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+
+Resources:
+
+- [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/)
+- [Microsoft Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/)
+- Contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with questions or concerns
+- Employees can reach out at [aka.ms/opensource/moderation-support](https://aka.ms/opensource/moderation-support)

SECURITY.md

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+<!-- BEGIN MICROSOFT SECURITY.MD V1.0.0 BLOCK -->
+
+## Security
+
+Microsoft takes the security of our software products and services seriously, which
+includes all source code repositories in our GitHub organizations.
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+For security reporting information, locations, contact information, and policies,
+please review the latest guidance for Microsoft repositories at
+[https://aka.ms/SECURITY.md](https://aka.ms/SECURITY.md).
+
+<!-- END MICROSOFT SECURITY.MD BLOCK -->