feat(publishing): implement PyPI publishing and release automation

- Added GitHub workflow for automated PyPI publishing on tag push
- Created CHANGELOG.md with v0.1.0 release notes following Keep a Changelog format
- Added comprehensive RELEASE.md with complete release documentation
- Updated pyproject.toml with changelog URL and improved metadata
- Enhanced README.md with installation and usage instructions

The publishing workflow includes:
- Automated PyPI publishing on version tags (v*)
- Security features with trusted publishing and API tokens
- Build verification and testing before release
- Support for both production and test PyPI environments

This establishes the foundation for professional package distribution
and follows Python packaging best practices.

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

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