Hold prior (ISV-driven, per-step +adv for Hold, -adv for non-Hold)
doesn't prevent collapse. PPO's importance ratio mechanism amplifies
done-step gradients exponentially, overwhelming linear hold prior.
Entropy controller upgraded: COEF_MAX=0.5, symmetric response with
COEF_FLOOR=0.01, emergency bypass when entropy < 50% target.
Entropy gradient added to PPO backward. Still insufficient.
Key finding: confidence_gate and frd_gate are configured but not
firing (gated_count=0). These gates should enforce surfer philosophy
at action-selection level. Investigating next.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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