Refactor editor host resource boundary

docs/plan/editor-core-refactor-plan.md

@@ -42,6 +42,11 @@ incomplete:
   explicit module roots instead of a private `editor/app` compatibility root.
   Concrete host code has converged under `editor/app/Host/Win32` and
   `editor/app/Host/D3D12`.
+- Native editor resources now cross the app-core boundary through a neutral
+  `EditorHostResourceService` contract under `editor/app/Host/Interfaces`.
+  `XCEditorCore` no longer consumes `app/Bootstrap` or Win32 resource helper
+  code to load built-in PNGs, title-bar branding, or executable-relative
+  capture output paths.
 - Feature panels no longer use `Composition/EditorContext.h` directly. The
   app-core and app feature/viewport test targets now exercise `XCEditorCore`
   outside the executable host.
@@ -81,8 +86,8 @@ Completed boundary cuts:
   `XCEditorCore` and `XCEditor`. App implementation files now include through
   explicit module roots such as `app/Composition`, `app/Features`,
   `app/Windowing`, `app/Rendering`, `app/Scene`, `app/Services`,
-  `app/Support`, `app/Bootstrap`, `app/Host/Interfaces`, `app/Host/Win32`,
-  and `app/Host/D3D12`.
+  `app/Support`, `app/Host/Interfaces`, `app/Host/Win32`, and
+  `app/Host/D3D12`; only executable-host code consumes `app/Bootstrap`.
 - `editor_app_core_tests` now links `XCEditorCore` directly and uses explicit
   app module include roots. Its initial suite covers host command routing,
   project runtime, shell asset validation, project browser model, hierarchy
@@ -448,6 +453,12 @@ Completed cuts:
 - Concrete Win32 and D3D12 host implementations now live under
   `app/Host/Win32` and `app/Host/D3D12`; `XCEditor` consumes those roots
   privately, while `XCEditorCore` only sees `app/Host/Interfaces`.
+- Native PNG resource lookup and executable-directory discovery now go through
+  `Host/Interfaces/EditorHostResourceService.h`. The concrete
+  `Host/Win32/Resources/Win32EditorResourceService.*` owns `EditorResources.h`,
+  Win32 resource APIs, and the mapping from product resource IDs to built-in
+  editor icon requests, so `XCEditorCore` no longer needs `app/Bootstrap` as a
+  private include root for resource loading.
 
 ## Phase 6: Documentation Update