Mesh Optimizer: sibling StaticMesh duplicate remover (UE 5.7)

Editor plugin that detects geometrically-identical sibling StaticMeshes across a
level, rebases each placement onto one canonical mesh with a corrected transform
(W' = D * W, verified by exact vertex matching), and can collapse groups into HISM.
Native Slate tool panel + BlueprintCallable UOptimizerSubsystem.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Source/OptimizerEditor/OptimizerEditor.Build.cs

@@ -0,0 +1,39 @@
+// Copyright IHY.
+
+using UnrealBuildTool;
+
+public class OptimizerEditor : ModuleRules
+{
+	public OptimizerEditor(ReadOnlyTargetRules Target) : base(Target)
+	{
+		PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;
+
+		PublicDependencyModuleNames.AddRange(new string[]
+		{
+			"Core",
+			"CoreUObject",
+			"Engine",                 // UStaticMesh, UStaticMeshComponent, AActor, FTransform
+		});
+
+		PrivateDependencyModuleNames.AddRange(new string[]
+		{
+			// --- editor core ---
+			"UnrealEd",               // GEditor, FScopedTransaction, UEditorActorSubsystem, editor world context
+			"EditorSubsystem",        // UEditorSubsystem (base of UOptimizerSubsystem)
+			"Slate",                  // notifications / future Slate bits
+			"SlateCore",
+			"InputCore",
+			"ToolMenus",              // UToolMenus — Tools menu entry
+			"Projects",               // IPluginManager
+			"UMG",                    // UWidgetBlueprint chain pulled in by the EUW headers
+			"UMGEditor",              // WidgetBlueprint.h include path (transitive via EditorUtilityWidgetBlueprint.h)
+			"Blutility",              // UEditorUtilitySubsystem / UEditorUtilityWidgetBlueprint (open the EUW panel)
+
+			// --- mesh geometry & asset discovery (load-bearing for fingerprinting) ---
+			"MeshDescription",        // FMeshDescription — LOD0 source vertex/poly data
+			"StaticMeshDescription",  // FStaticMeshAttributes, UStaticMesh::GetMeshDescription
+			"AssetRegistry",          // enumerate UStaticMesh assets when needed
+			"AssetTools",             // asset metadata helpers
+		});
+	}
+}