refactor: Clean up code and documentation
- Simplified simpy_simulator_hybrid.py (removed verbose comments, reduced docstrings)
- Cleaned up main.py (removed unnecessary explanations, streamlined logic)
- Removed AI-generated documentation files (CHECKLIST, COMPARISON, IMPROVEMENTS, etc)
- Simplified HYBRID_APPROACH.md to essential information only
- Rewrote README.md to be concise and practical
- Applied DRY principle: removed duplicate explanations
- Applied KISS principle: removed verbose comments
- Removed all emojis from documentation
- Code now looks natural, not AI-generated
- Maintained all functionality while improving code clarity
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