The reward_scale oscillated 10,873× (min 0.000123, max 1.33) because
the Wiener-α=0.4 blend tracked sparse trade PnL spikes instantly.
Old transitions in PER had stale-scale rewards even with raw-reward
re-normalization (the current scale itself was unstable).
Per-step clamp: scale can only move ±2% from previous value.
Doubling takes ~35 steps, halving takes ~35 steps — fast enough to
track regime changes, stable enough for Q targets across the replay
window. Max oscillation over 1000 steps: ~7× (was 10,873×).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
408e0ef4ac