Observed train-vpb4w freeze at epoch 23 (val_Sharpe=51.11):
- avg_grad=10.0 (nonzero!) but Q-stats FROZEN for 4+ epochs
- Root cause: Adam momentum converged to fixed point, not zero gradient
Component 10: Targeted Adam momentum reset for branch weights only
(indices 8-41). Lighter than full rewind, preserves trunk convergence.
Component 11: Q-gap target attractor for spread gradient. Amplifies
spread when Q-gap is below target, reduces when above. Prevents
spread from being too weak at high Q-gap levels.
Component 12: Cosine LR schedule with warm restarts (T=20 epochs).
LR decay prevents overshoot, restart jumps break fixed points.
Half-momentum at restart preserves gradient direction.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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