Refactor toolkit.py with logging, error handling, and CLI improvements #1599
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✅ Added logging to improve user feedback and runtime visibility
✅ Implemented input path validation to catch missing or invalid files
✅ Wrapped core logic in exception handling to prevent crashes
✅ Introduced --version and CLI usage examples via epilog
✅ Made --generate and --validate mutually exclusive to prevent misuse
✅ Cleaned up messages and structured flow for better UX