The function re-ran 15+ kernels (expected_q, q_mean_center, q_anchoring,
risk_budget, branch_confidence, epistemic_gate, temporal_consistency,
branch_independence, q_attention, graph_message_pass, q_denoise) outside
the graph every step — duplicating work the graph already did.
Now: q_out_buf is populated by graph replay (populate_q_out in aux_child).
reduce_current_q_stats just runs q_stats_kernel (1 kernel) + DtoH sync.
Runs every step since cost is now ~1ms, not ~4s.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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