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

[trim] fully-unreachable files deleted: 3
[trim] files edited: 21, files deleted: 0, nodes removed: 38
[type-trim] files edited: 3, types removed: 3

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

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

@@ -4,9 +4,4 @@ using LitJson;
 using UnityEngine;
 namespace Wizard
 {
-public partial class MailTopTask
-{
-        public partial class MailTopTaskParam { }
-        public MailTopTask() { }
-}
 }