test(physics): pin issue 270 animation fixes

src/AcDream.App/Net/LiveSessionRuntimeFactory.cs

@@ -98,6 +98,7 @@ internal sealed class LiveSessionRuntimeFactory
     private readonly LiveSessionWorldRuntime _world;
     private readonly LiveSessionCommandSurface _commands;
     private readonly Action<string> _log;
+    private readonly StaminaExhaustionEdgeTracker _staminaExhaustion = new();
 
     public LiveSessionRuntimeFactory(
         LiveSessionPlayerRuntime player,
@@ -189,6 +190,7 @@ internal sealed class LiveSessionRuntimeFactory
 
     private void ResetPlayerPresentation()
     {
+        _staminaExhaustion.Reset();
         _interaction.PlayerMode.ResetSession();
         _world.SpawnClaims.Reset();
     }
@@ -289,13 +291,6 @@ internal sealed class LiveSessionRuntimeFactory
             OnMovementStatsUpdated: () => ApplyMovementStats("stats"));
     }
 
-    /// <summary>
-    /// Tracks the previous "stamina exhausted" state so
-    /// <see cref="ApplyMovementStats"/> can fire retail's exhaustion
-    /// notification on the EDGE only. Null = no stamina reading applied yet.
-    /// </summary>
-    private bool? _lastStaminaExhausted;
-
     /// <summary>
     /// Re-applies the current <see cref="RuntimeMovementSkillState"/>
     /// snapshot (skills/burden/stamina) to the live player controller.
@@ -328,14 +323,8 @@ internal sealed class LiveSessionRuntimeFactory
         }
 
         RuntimeMovementSkillSnapshot snapshot = _domain.Character.MovementSkills.Snapshot;
-        bool exhausted = snapshot.CurrentStamina == 0;
-        if (_lastStaminaExhausted != exhausted)
-        {
-            bool isEdge = _lastStaminaExhausted is not null;
-            _lastStaminaExhausted = exhausted;
-            if (isEdge)
-                controller!.Motion.ReportExhaustion();
-        }
+        if (_staminaExhaustion.Observe(snapshot.CurrentStamina))
+            controller!.Motion.ReportExhaustion();
 
         _log(
             $"player: applied server movement {reason} "

src/AcDream.App/Net/StaminaExhaustionEdgeTracker.cs

@@ -0,0 +1,32 @@
+namespace AcDream.App.Net;
+
+/// <summary>
+/// Tracks retail's stamina-exhaustion notification edge for one live-session
+/// generation.
+/// </summary>
+internal sealed class StaminaExhaustionEdgeTracker
+{
+    private bool? _wasExhausted;
+
+    /// <summary>
+    /// Observes the current stamina value and returns <see langword="true"/>
+    /// only when a previously initialized state changes between exhausted and
+    /// non-exhausted.
+    /// </summary>
+    public bool Observe(int currentStamina)
+    {
+        bool exhausted = currentStamina == 0;
+        if (_wasExhausted == exhausted)
+            return false;
+
+        bool isEdge = _wasExhausted.HasValue;
+        _wasExhausted = exhausted;
+        return isEdge;
+    }
+
+    /// <summary>
+    /// Forgets the retiring character/session sample. The first sample in the
+    /// next generation establishes a baseline and must not synthesize an edge.
+    /// </summary>
+    public void Reset() => _wasExhausted = null;
+}