A: train_step_gpu must not capture its own graphs (rename to submit_training_ops_ungraphed) B: Mamba2 backward must be inside unified graph (forward+backward same capture) C: submit_adam_ops signature verified, needs weight set refs D: cuBLAS workspace sharing — add verification logging, fail if >32MB needed Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>