Add test_dashboard.py utility script

test_dashboard.py

@@ -0,0 +1,14 @@
+from dashboard import compute_metrics
+
+metrics = compute_metrics(42)
+for agent, data in metrics.items():
+    print(f"\n{agent}:")
+    for diff, m in data.items():
+        s = m['score']
+        c = m['cleared']
+        r = m['reward']
+        w = m['avg_wait']
+        if c is not None:
+            print(f"  {diff:8}: score={s} | cleared={c} | reward={r} | wait={w}")
+        else:
+            print(f"  {diff:8}: score={s}")