chore: add SECURITY.md

Author: t-timms

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 issue
+2. Email: ttimms.international@gmail.com with details
+3. Include: description, reproduction steps, impact assessment
+
+## Supported Versions
+
+| Version | Supported |
+|---------|-----------|
+| Latest  | Yes       |