cull(engine-cleanup): pass-8 phase-2 cascade round 1

[trim] fully-unreachable files deleted: 6
[trim] files edited: 55, files deleted: 0, nodes removed: 244
[type-trim] files edited: 1, types removed: 1

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

SVSim.BattleEngine/Shim/Generated/MailTopTask.g.cs

@@ -7,12 +7,6 @@ namespace Wizard
 public partial class MailTopTask
 {
         public partial class MailTopTaskParam { }
-        public int? LastPageRead { get; set; }
-        public long ServerTime { get; set; }
-        public long RequestTime { get; set; }
         public MailTopTask() { }
-        public void SetToFirstPage() { }
-        public void SetParameter(bool isTutorial) { }
-        public void SetParameterToNextPage() { }
 }
 }