test: hyperopt backtest metrics output in smoketest

Sharpe=-1.27, 269 trades, 22% win rate — expected for 3 random epochs.
Full PSO → train → GPU backtest → Sharpe objective pipeline validated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/ml/src/trainers/dqn/smoke_tests/hyperopt.rs

@@ -93,12 +93,12 @@ fn test_hyperopt_trial_produces_backtest_metrics() -> anyhow::Result<()> {
     assert!(bt.sharpe_ratio.is_finite(), "Sharpe is not finite: {}", bt.sharpe_ratio);
     assert!(bt.total_trades > 0, "Zero trades in backtest");
 
-    tracing::info!(
-        sharpe = bt.sharpe_ratio,
-        trades = bt.total_trades,
-        win_rate = bt.win_rate,
-        max_dd = bt.max_drawdown_pct,
-        "Hyperopt backtest metrics PASS"
+    eprintln!(
+        "Hyperopt backtest: Sharpe={:.2} Trades={} WinRate={:.1}% MaxDD={:.1}% \
+         Loss={:.3} Epochs={} Q={:.4}",
+        bt.sharpe_ratio, bt.total_trades, bt.win_rate * 100.0,
+        bt.max_drawdown_pct, metrics.train_loss, metrics.epochs_completed,
+        metrics.avg_q_value,
     );
 
     Ok(())