Root nodes join through ModRoot.AddDeferred, so a reload that unloads the mod first never hands Godot a freed node

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test_suites/ingame_play/src/InGamePlayTestInitializer.cs

@@ -25,7 +25,7 @@ namespace Cthangover.Tools.Tests.InGamePlay
 
             driverQueued = true;
             GameLogger.Log("TEST", "InGamePlayTestInitializer: activating in-game play-test test");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new InGamePlayTestDriverNode());
+            ModRoot.AddDeferred(new InGamePlayTestDriverNode());
         }
     }
 }

test_suites/novel_flow/src/NovelFlowTestInitializer.cs

@@ -31,7 +31,7 @@ namespace Cthangover.Tools.Tests.NovelFlow
                 .Select(a => a.Substring("--shots=".Length))
                 .FirstOrDefault();
             GameLogger.Log("TEST", $"NovelFlowTestInitializer: activating novel_flow, shots={shots ?? "off"}");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new NovelFlowTestDriver(shots));
+            ModRoot.AddDeferred(new NovelFlowTestDriver(shots));
         }
     }
 }

test_suites/windows/src/ToolWindowsTestInitializer.cs

@@ -37,7 +37,7 @@ namespace Cthangover.Tools.Tests.Windows
 
             driverQueued = true;
             GameLogger.Log("TEST", $"ToolWindowsTestInitializer: activating tool windows test, shots='{shots ?? ""}'");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new ToolWindowsTestDriverNode(shots));
+            ModRoot.AddDeferred(new ToolWindowsTestDriverNode(shots));
         }
     }
 }