Reverted to the structure that WORKED on H100: ISV kernels inside
submit_forward_ops_main (captured in graph_mega). Removed duplicate
pre-replay calls. The working version had ISV in graph_mega — removing
them was wrong. Added plan_noise_inject to the same block.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>