Fix 2: Eliminate validation graph re-capture (DtoD into same buffers) Fix 3: Async validation on separate CUDA stream (overlap with experience) Fix 4: Aux GEMM in graph_aux (GPU scalar + kernel sig change) Fix 7: Mega-graph fusion (spectral+forward+aux → 2 launches) Combined with 5 implemented fixes: 47s → ~16s/epoch Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>