Changes:
- Add virtual environment setup as recommended installation method
- Keep legacy global installation options for experienced users
- Add Python version requirements (3.8+)
- Provide clear guidance on which installation method to choose
- Update running instructions for both virtual env and global installs
- Cross-reference README_VENV.md for detailed virtual environment docs
The guide now recommends the automated virtual environment setup while
preserving the original Windows-specific installer for users who prefer
global installation or need fallback options.
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Co-Authored-By: Claude <noreply@anthropic.com>
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