Implements some micro-optimizations

AI/AIRunner/TestCommandRunner.cs

@@ -59,7 +59,7 @@ public static class TestCommandRunner
                 Log.Debug("Starting {TaskCount} tasks", maxTasks);
                 await Task.WhenAll(battleTasks);
                 Log.Debug("Batch of {TaskCount} tasks completed", maxTasks);
-                battleTasks = new Task[maxTasks]; // Reset tasks for the next batch
+                Array.Fill(battleTasks, Task.CompletedTask); // Reset tasks for the next batch
             }
         }