fix(gamecli): wrap angle in reward to prevent unbounded spin penalty

GameCli.Tests/RewardTests.cs

@@ -53,4 +53,19 @@ public class RewardTests
         Assert.True(rMain < rNoop, "firing main should be worse than noop");
         Assert.True(rLeft < rNoop, "firing left should be worse than noop");
     }
+
+    [Fact]
+    public void AngleWrap_FullRevolutionsProduceSameReward()
+    {
+        // Physically identical poses (angle differs by 2π) must produce the same reward.
+        // Otherwise a spinning ship accumulates unbounded angle penalty.
+        var upright   = new ShipState(0.5f, 0.5f, 0f, 0f, 0f, 0f);
+        var oneSpin   = new ShipState(0.5f, 0.5f, 0f, 0f,  2f * MathF.PI, 0f);
+        var fiveSpins = new ShipState(0.5f, 0.5f, 0f, 0f, 10f * MathF.PI, 0f);
+        float r0 = Reward.Compute(upright,   target: (0.5f, 0.5f), action: 0);
+        float r1 = Reward.Compute(oneSpin,   target: (0.5f, 0.5f), action: 0);
+        float r5 = Reward.Compute(fiveSpins, target: (0.5f, 0.5f), action: 0);
+        Assert.Equal(r0, r1, precision: 4);
+        Assert.Equal(r0, r5, precision: 4);
+    }
 }