New diag fields in the "trading" object:
- pnl_cum_usd: cumulative realized PnL in USD (shaped, pre-scale)
- total_trades: lifetime trade count
- win_rate: fraction of positive-PnL closes
- avg_hold_steps: mean hold duration in steps
- raw_reward_sum: per-step sum of shaped rewards
Log line now shows sps (steps/sec), pnl (cumulative $), wr (win rate).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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