Command-line interface for the BalancedTernaryEngine tool.

Four commands share one option parser:

• convert — safetensors checkpoint → .tbin (or synthetic model when no --input is given)
• demo — quantize/pack/GEMM walkthrough on random weights
• info — inspect a .tbin file
• validate — round-trip + per-layer forward verification

Options are parsed with OptionParser under strict: mode, so typos like --deltta are reported instead of being silently ignored.