test(physics): pin issue 270 animation fixes

tests/AcDream.App.Tests/Net/StaminaExhaustionEdgeTrackerTests.cs

@@ -0,0 +1,52 @@
+using AcDream.App.Net;
+
+namespace AcDream.App.Tests.Net;
+
+public sealed class StaminaExhaustionEdgeTrackerTests
+{
+    [Theory]
+    [InlineData(100)]
+    [InlineData(0)]
+    public void FirstSample_EstablishesBaselineWithoutNotification(int stamina)
+    {
+        var tracker = new StaminaExhaustionEdgeTracker();
+
+        Assert.False(tracker.Observe(stamina));
+    }
+
+    [Fact]
+    public void RepeatedStatsTicks_DoNotRedispatchMovement()
+    {
+        var tracker = new StaminaExhaustionEdgeTracker();
+
+        Assert.False(tracker.Observe(100));
+        Assert.False(tracker.Observe(99));
+        Assert.False(tracker.Observe(50));
+        Assert.False(tracker.Observe(1));
+    }
+
+    [Fact]
+    public void ExhaustedStateTransitions_ReportExactlyOncePerEdge()
+    {
+        var tracker = new StaminaExhaustionEdgeTracker();
+
+        Assert.False(tracker.Observe(50));
+        Assert.True(tracker.Observe(0));
+        Assert.False(tracker.Observe(0));
+        Assert.True(tracker.Observe(1));
+        Assert.False(tracker.Observe(80));
+    }
+
+    [Fact]
+    public void Reset_PreventsCrossGenerationSyntheticEdge()
+    {
+        var tracker = new StaminaExhaustionEdgeTracker();
+        Assert.False(tracker.Observe(50));
+        Assert.True(tracker.Observe(0));
+
+        tracker.Reset();
+
+        Assert.False(tracker.Observe(75));
+        Assert.True(tracker.Observe(0));
+    }
+}