Major feature update introducing:
- Compression level control (-l1 to -l9)
- Multi-threading support (-t4)
- File filtering (--include/--exclude patterns)
- Performance benchmarking (--benchmark)
- Archive verification (--verify)
- Modern compression formats (LZ4, Zstandard, XAR)
- Enhanced interactive mode and verbose output

Full backward compatibility with v1.x maintained.
Enterprise-grade compression tool with user-friendly interface.