- Add tx_cost_bps/tick_size/spread_ticks CLI args to tggn, xlstm, diffusion - Subtract spread + commission from target returns during data prep - Delete unused validate_model_parameters from train_mamba2_dbn - Wire validate_training_batch into mamba2 pre-training validation All 16 training examples now compile with zero warnings. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>