- Add batch_delay() to shift visible input per unit index
- Unify forward_step() to work with combined vc matrix
- Fix split() to always slice on axis=1
- Add index param to Entity for readable naming
- Rename test_xor.py to xor.py, replace Mat with np.array
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>