selectivity_backward, risk_budget_backward, mamba2_scan_backward,
q_denoise_backward — all converted to per-weight-element accumulation
(one thread per weight, loops over batch) with plain deterministic
writes. Zero atomicAdd in these gradient paths.
recursive_confidence_backward, temporal_consistency_penalty,
predictive_coding_loss, compute_expected_q atom_stats — converted to
warp+block tree reduction, reducing to one atomicAdd per BLOCK
(8x fewer warps → near-deterministic).
kan_gate_backward, curiosity, DT linear — documented remaining
atomicAdd as acceptable (auxiliary components, not on primary DQN
gradient path).
Rust launchers updated: grid dimensions now match per-weight-element
thread counts for selectivity, mamba2, and denoise backward kernels.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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