Introduce editor core boundary

editor/app/Composition/EditorShellRuntime.cpp

@@ -5,15 +5,19 @@
 #include <XCEditor/Shell/UIEditorShellCapturePolicy.h>
 #include <XCEngine/Rendering/RenderContext.h>
 
+#include <utility>
+
 namespace XCEngine::UI::Editor::App {
 
+EditorShellRuntime::EditorShellRuntime(EditorWorkspacePanelRuntimeSet workspacePanels)
+    : m_workspacePanels(std::move(workspacePanels)) {}
+
 void EditorShellRuntime::Initialize(
     const std::filesystem::path& repoRoot,
     Rendering::Host::UiTextureHost& textureHost,
     UIEditorTextMeasurer& textMeasurer) {
     m_textureHost = &textureHost;
     m_builtInIcons.Initialize(textureHost);
-    m_workspacePanels = CreateEditorWorkspacePanelRuntimeSet();
     m_workspacePanels.Initialize(
         EditorWorkspacePanelInitializationContext{
             .repoRoot = repoRoot,