docs: add CONTRIBUTING.md and SECURITY.md

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing! 🎉
+
+## How to Contribute
+
+1. **Fork** the repository
+2. **Create a feature branch**: `git checkout -b feature/my-feature`
+3. **Commit your changes**: `git commit -m 'Add my feature'`
+4. **Push to the branch**: `git push origin feature/my-feature`
+5. **Open a Pull Request**
+
+## Guidelines
+
+- Keep PRs small and focused
+- Add tests for new functionality
+- Follow existing code style
+- Update documentation if needed
+
+## Reporting Issues
+
+- Use GitHub Issues to report bugs
+- Include steps to reproduce
+- Mention your OS and Python version
+
+## Questions?
+
+Open an issue or reach out at [evey.cc](https://evey.cc).
+

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability, please report it responsibly:
+
+- **Do NOT** open a public issue
+- Email: security@evey.cc or report via GitHub Security Advisories
+- Include details about the vulnerability and steps to reproduce
+
+We will respond within 48 hours and keep you updated on the fix.
+
+## Supported Versions
+
+Only the latest release is actively supported for security updates.
+