Cheng 4.43

• NN based evaluation (topo 736-192-4-1), goodbye HCE
• no incremental inference updates, so a bit slower
• custom inference with layer 1 zero skip trick
• inverse sigmoid to convert win probability to cp, oscillates a lot with big evals
• trained on 1.7M cheng self-play fixed node games, yielding ~125M filtered positions
• labeled on 6-ply cheng search and game outcome
• includes custom hacky libtorch-based tuner
• bench 11152861
• dropped support for Windows XP