compute_expected_q was called with null_atom_stats=0 (NULL pointer),
so the kernel skipped atom entropy/utilization accumulation entirely.
atom_stats_buf existed but was never passed. This disabled:
- G4 adaptive gamma annealing (uses atom_utilization)
- Homeostatic regularizer atom_util observable
- ISV atom utilization signal
Now passes atom_stats_buf.raw_ptr() with a cuMemsetD32 zero before
each call (kernel uses atomicAdd). Also passes q_var_buf_trainer for
per-action Q-variance computation.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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