Hyperopt TPE was stuck chasing phantom Sharpe=2317 from degenerate trials
with 2/45 unique actions (temp 0.15-0.20). Two fixes:
1. Raise eval_softmax_temp bounds from [0.1, 2.0] to [0.5, 2.0] — temps
below 0.3 consistently produce 1-3/45 actions regardless of model quality
2. Add diversity_penalty to objective: 50*(1 - unique/10) for <10/45 actions,
so degenerate trials score badly even if they accidentally reach the TPE
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
d3a3403053