Give the stance-test gun a burst and a cooldown

The default InstantWeaponData has Count 0, so the fixture gun never had a round to fire.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/Aetheria.Shared.Tests/IffAndCombatTests.cs

@@ -32,7 +32,7 @@ public sealed class IffAndCombatTests : IDisposable
         cache.Upsert(new GearData
         {
             Name = "Gun", Hardpoint = HardpointType.Sensors, Shape = new Shape(), Durability = 1,
-            Behaviors = { new InstantWeaponData() }
+            Behaviors = { new InstantWeaponData { Count = new PerformanceStat { Min = 1, Max = 1 }, Cooldown = new PerformanceStat { Min = 1, Max = 1 } } }
         });
         cache.FlushAsync().Wait();
     }