Add community interaction files

- CONTRIBUTING.md: Comprehensive contributor guidelines
- CHANGELOG.md: Version history and release notes
- CODE_OF_CONDUCT.md: Community standards and behavior guidelines
- SECURITY.md: Security policy and vulnerability reporting
- GitHub issue templates: Bug reports, features, questions
- Pull request template: Structured PR submissions

Enhances community engagement and project governance.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.github/pull_request_template.md

@@ -0,0 +1,62 @@
+# Pull Request
+
+## Legend
+| Symbol | Meaning | | Abbrev | Meaning |
+|--------|---------|---|--------|---------|
+| → | leads to | | cfg | configuration |
+| ✓ | completed | | PR | pull request |
+
+## Summary
+Brief description of changes
+
+## Type of Change
+- [ ] 🐛 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
+- [ ] 🔧 Configuration change
+- [ ] 🎨 Code style/formatting change
+- [ ] ♻️ Refactoring (no functional changes)
+- [ ] ⚡ Performance improvement
+- [ ] 🔒 Security fix
+
+## Changes Made
+- Change 1
+- Change 2
+- Change 3
+
+## Testing
+- [ ] Tested install.sh on clean system
+- [ ] Verified slash commands work in Claude Code
+- [ ] Checked YAML syntax validity
+- [ ] Tested persona functionality
+- [ ] Tested MCP integration
+- [ ] Manual testing performed
+- [ ] All existing tests pass
+
+## Related Issues
+Fixes #(issue number)
+Closes #(issue number)
+Related to #(issue number)
+
+## Screenshots (if applicable)
+<!-- Add screenshots to demonstrate visual changes -->
+
+## Checklist
+- [ ] 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
+
+## Additional Notes
+<!-- Any additional information, concerns, or notes for reviewers -->
+
+## Breaking Changes
+<!-- If this is a breaking change, describe what users need to do to migrate -->
+
+---
+**Ready for review!** 🚀