fix(guild): emblem_list wire shape — add wire-shape test locking shape (b)

GuildEmblemListTask.Parse reads jsonData[i][emblem_id].ToLong(),
confirming shape (b): array of objects with emblem_id. The existing
List<GuildEmblemEntry> DTO was already correct. Add
EmblemList_serializes_as_array_of_objects_with_emblem_id test to
GuildWireShape to lock the shape in.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.UnitTests/Wire/GuildWireShape.cs

@@ -13,6 +13,28 @@ public class GuildWireShape
         DefaultIgnoreCondition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingNull,
     };
 
+    [Test]
+    public void EmblemList_serializes_as_array_of_objects_with_emblem_id()
+    {
+        // GuildEmblemListTask.Parse() reads jsonData[i]["emblem_id"].ToLong()
+        // → wire must be an array of objects, each with an "emblem_id" string field.
+        var resp = new GuildEmblemListResponse
+        {
+            EmblemList = new() { new GuildEmblemEntry { EmblemId = 100_000_001L }, new GuildEmblemEntry { EmblemId = 100_000_002L } }
+        };
+        var json = JsonSerializer.Serialize(resp, Opts);
+        using var doc = JsonDocument.Parse(json);
+        var arr = doc.RootElement.GetProperty("guild_emblem_list");
+
+        Assert.That(arr.ValueKind, Is.EqualTo(JsonValueKind.Array));
+        Assert.That(arr.GetArrayLength(), Is.EqualTo(2));
+
+        var first = arr[0];
+        Assert.That(first.ValueKind, Is.EqualTo(JsonValueKind.Object));
+        Assert.That(first.GetProperty("emblem_id").ValueKind, Is.EqualTo(JsonValueKind.String));
+        Assert.That(first.GetProperty("emblem_id").GetString(), Is.EqualTo("100000001"));
+    }
+
     [Test]
     public void GuildInfo_non_joined_serializes_to_prod_shape()
     {