feat(items): add Poison Wing (12/240) and Poison Cape (12/241)

Basic wings via the simple CreateWing overload (base defense, class
restriction, CanFly; no options). Poison Wing=Dark Knight, Poison
Cape=Dark Lord+Rage Fighter. Update-plugin v98 + fresh-seed via
Wings.Initialize().

src/Persistence/Initialization/Updates/AddPoisonWingsUpdateSeason6.cs

@@ -0,0 +1,56 @@
+// <copyright file="AddPoisonWingsUpdateSeason6.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Persistence.Initialization.Updates;
+
+using System.Runtime.InteropServices;
+using MUnique.OpenMU.DataModel.Configuration;
+using MUnique.OpenMU.Persistence.Initialization.VersionSeasonSix.Items;
+using MUnique.OpenMU.PlugIns;
+
+/// <summary>
+/// Adds two imported wings at free item slots: Poison Wing (12/240, Dark Knight) and
+/// Poison Cape (12/241, Dark Lord + Rage Fighter). Basic wings: base defense, class
+/// restriction, CanFly; no wing options.
+/// </summary>
+[PlugIn]
+[Display(Name = PlugInName, Description = PlugInDescription)]
+[Guid("7E4A2C63-9B1D-4F8A-A5C6-1D3E8F2B4A07")]
+public class AddPoisonWingsUpdateSeason6 : UpdatePlugInBase
+{
+    internal const string PlugInName = "Add Poison Wing & Poison Cape (12/240, 12/241)";
+    internal const string PlugInDescription = "Adds Poison Wing (12/240, Dark Knight) and Poison Cape (12/241, Dark Lord + Rage Fighter) as basic wings.";
+
+    /// <inheritdoc />
+    public override UpdateVersion Version => UpdateVersion.AddPoisonWingsSeason6;
+
+    /// <inheritdoc />
+    public override string DataInitializationKey => VersionSeasonSix.DataInitialization.Id;
+
+    /// <inheritdoc />
+    public override string Name => PlugInName;
+
+    /// <inheritdoc />
+    public override string Description => PlugInDescription;
+
+    /// <inheritdoc />
+    public override bool IsMandatory => true;
+
+    /// <inheritdoc />
+    public override DateTime CreatedAt => new(2026, 07, 19, 17, 0, 0, DateTimeKind.Utc);
+
+    /// <inheritdoc />
+#pragma warning disable CS1998
+    protected override async ValueTask ApplyAsync(IContext context, GameConfiguration gameConfiguration)
+#pragma warning restore CS1998
+    {
+        // Idempotency guard: skip if Poison Wing (12/240) already exists.
+        if (gameConfiguration.Items.Any(i => i.Group == 12 && i.Number == 240))
+        {
+            return;
+        }
+
+        new Wings(context, gameConfiguration).CreatePoisonWings();
+    }
+}

src/Persistence/Initialization/Updates/UpdateVersion.cs

@@ -494,4 +494,9 @@ public enum UpdateVersion
     /// The version of the <see cref="AddImportedMapsUpdateSeason6"/> (Acheron, Debenter, Uruk, Ferea).
     /// </summary>
     AddImportedMapsSeason6 = 97,
+
+    /// <summary>
+    /// The version of the <see cref="AddPoisonWingsUpdateSeason6"/> (Poison Wing 12/240, Poison Cape 12/241).
+    /// </summary>
+    AddPoisonWingsSeason6 = 98,
 }