Bump ruff line-length to 120 and reformat

Rejoins lines that only wrapped because they exceeded the old 88-char
limit; ruff check and the full test suite (725 passed) are unaffected.

scripts/hparam_scan.py

@@ -154,9 +154,7 @@ def run_hparam_scan(
         wall_time_s = time.monotonic() - start
 
         if metrics_path.exists():
-            epochs_completed, final_val_loss, best_val_loss = final_metrics(
-                metrics_path
-            )
+            epochs_completed, final_val_loss, best_val_loss = final_metrics(metrics_path)
             append_summary(
                 summary_path,
                 {
@@ -171,11 +169,6 @@ def run_hparam_scan(
                     "wall_time_s": round(wall_time_s, 1),
                 },
             )
-            print(
-                f"[{i}/{len(runs)}] {name} — val_loss {final_val_loss:.4f} "
-                f"({wall_time_s:.1f}s)"
-            )
+            print(f"[{i}/{len(runs)}] {name} — val_loss {final_val_loss:.4f} ({wall_time_s:.1f}s)")
         else:
-            print(
-                f"[{i}/{len(runs)}] {name} — no metrics.csv produced, check train.log"
-            )
+            print(f"[{i}/{len(runs)}] {name} — no metrics.csv produced, check train.log")