User-requested static-analysis-first bisect (Option 2): comment out
both launch_c51_aux_dw and launch_adam_w_aux in submit_adam_ops to
isolate forward vs backward as NaN source.
With these disabled:
- Forward atom-shift kernels still run (no-op with W=0)
- W stays at [0,0,0,0] (no Adam update)
- dW kernel doesn't run
Hypothesis test:
- Clean smoke -> backward is the bug
- NaN persists -> forward is the bug
Audit doc updated. Cargo check clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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