docs: add SECURITY.md

Author: williamzujkowski

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, please report it responsibly:
+
+1. **Do NOT open a public GitHub issue**
+2. Use GitHub's private vulnerability reporting feature
+3. Include: description, steps to reproduce, potential impact
+4. Allow 90 days for a fix before public disclosure
+
+## Supported Versions
+
+Only the latest release is actively supported with security updates.