c51_grad_kernel reads liquid_mod[d] per branch instead of spread_velocity[0].
4 per-branch Q-gap EMAs with adaptive alpha drive continuous-time ODE.
Fast branch learning → large tau → slow adaptation → don't overshoot.
Stuck branch → small tau → fast adaptation → push harder.
spread_velocity infrastructure removed (-30 lines).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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