v0.6
feat: add sparse file support, encryption, compression levels, and comprehensive tests
- Add ChaCha20-Poly1305 encryption with auto-generated keys (-e flag)
- Add compression level control (-L fast/default/better/best)
- Add IP binding option (-i flag)
- Optimize zero block handling - no network transfer, preserves sparse holes
- Fix block calculation off-by-one bug affecting truncation
- Add buffer pools for decompression to reduce GC pressure
- Increase zero buffer from 1MB to 100MB
- Add 20 new flag tests (multi-worker, encryption, compression, block sizes)
- Update README with all features and examples
All 63 tests passing.