Route final texture setup sites through helper

docs/modernization/debt.md

@@ -18,6 +18,10 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-13: DEBT-0036 was narrowed again. `NodeCanvas` density-resolve and
+  desktop VR UI `Texture` shader setup now route through
+  `legacy_canvas_draw_merge_services.h`; those paths still own render target,
+  sampler/texture binding, viewport/state restoration, and draw execution.
 - 2026-06-13: DEBT-0036 was narrowed again. `CanvasModeTransform::on_Draw`
   and `CanvasModeFloodFill::on_Draw` retained `Texture` shader setup now route
   through `legacy_canvas_draw_merge_services.h`; the mode paths still own

docs/modernization/roadmap.md

@@ -3051,6 +3051,10 @@ Results:
   share the retained draw-merge texture shader setup helper for `Texture`,
   `Tex`, and `MVP` setup. Texture/sampler binding, viewport/state setup, and
   draw execution remain in the node paths.
+- `NodeCanvas` density-resolve drawing and desktop VR UI drawing now share the
+  retained draw-merge texture shader setup helper, while render target,
+  sampler/texture binding, viewport/state restoration, and draw execution
+  remain in retained node/VR code.
 - `CanvasModeTransform::on_Draw` and `CanvasModeFloodFill::on_Draw` now share
   the retained draw-merge texture shader setup helper for `Texture`, `Tex`, and
   `MVP` setup. Active texture selection, sampler/texture binding, and draw