refactor(net): converge live session state reset

src/AcDream.App/Combat/CombatAttackController.cs

@@ -403,6 +403,19 @@ public sealed class CombatAttackController : IDisposable
         ResetPowerBar();
     }
 
+    /// <summary>
+    /// Restore the process-lived attack controller to retail's new-session
+    /// defaults without sending a cancel packet through the displaced session.
+    /// Mirrors <c>ClientCombatSystem::Begin @ 0x0056A460</c>.
+    /// </summary>
+    public void ResetSession()
+    {
+        Reset();
+        RequestedHeight = AttackHeight.Medium;
+        DesiredPower = InitialDesiredPower;
+        StateChanged?.Invoke();
+    }
+
     public void Dispose()
     {
         if (_disposed) return;