feat: Add comprehensive license and repository protection

- Add MIT LICENSE file with proper copyright attribution
- Add SECURITY.md with vulnerability reporting guidelines
- Add CONTRIBUTING.md with contribution guidelines and standards
- Add CODE_OF_CONDUCT.md following Contributor Covenant 2.1
- Add .github/CODEOWNERS for code ownership protection
- Add GitHub issue templates (bug report, feature request)
- Add pull request template for standardized PRs
- Add automated workflows for code quality and security checks
- Add dependency review workflow for license compliance

This establishes professional standards and protections for the repository.

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request
+
+## Description
+
+<!-- Provide a clear and concise description of your changes -->
+
+## Type of Change
+
+<!-- Mark the relevant option with an 'x' -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Code refactoring
+- [ ] Performance improvement
+- [ ] Test improvement
+
+## Related Issues
+
+<!-- Link related issues using keywords: Fixes #123, Closes #456, Related to #789 -->
+
+Fixes #
+
+## Changes Made
+
+<!-- List the main changes in bullet points -->
+
+-
+-
+-
+
+## Testing Performed
+
+<!-- Describe the testing you've done -->
+
+- [ ] Unit tests added/updated
+- [ ] Integration tests added/updated
+- [ ] Manual testing performed
+- [ ] All existing tests pass
+
+### Test Details
+
+<!-- Provide details about how you tested your changes -->
+
+```bash
+# Example test commands
+pytest tests/
+```
+
+## Screenshots (if applicable)
+
+<!-- Add screenshots to help explain your changes -->
+
+## Checklist
+
+<!-- Ensure all items are completed before submitting -->
+
+- [ ] My code follows the project's style guidelines
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published
+- [ ] I have checked my code and corrected any misspellings
+
+## Additional Context
+
+<!-- Add any other context about the pull request here -->
+
+## Breaking Changes
+
+<!-- If this is a breaking change, describe the impact and migration path -->
+
+## Performance Impact
+
+<!-- Describe any performance implications of your changes -->
+
+---
+
+**By submitting this pull request, I confirm that my contribution is made under the terms of the MIT License.**