Extract dual shader setup wrapper

docs/modernization/debt.md

@@ -544,6 +544,9 @@ agent or engineer to remove them without reconstructing context from chat.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw()` pad copy
   behavior now uses a retained helper for copy-region wiring; the pad branch
   still owns the concrete framebuffer and texture-object callbacks.
+- 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw()` dual-pass
+  shader setup now uses a retained wrapper helper; the dual-pass branch still
+  owns the concrete shader selection and framebuffer wiring.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::draw_merge` checkerboard
   background shader setup and final merged-texture redraw setup now route
   through `legacy_canvas_draw_merge_services.h`. The retained Canvas path still

docs/modernization/tasks.md

@@ -757,7 +757,7 @@ ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_composito
 
 ### STR-026 - Extract Stroke Draw Dual Pass Shader Setup Wrapper
 
-Status: Ready
+Status: Done
 Score: +1 renderer boundary and OpenGL parity
 Debt: `DEBT-0036`
 Scope: `src/canvas.cpp`, `src/legacy_canvas_stroke_execution_services.h`, `tests/paint_renderer/compositor_tests.cpp`
@@ -783,6 +783,12 @@ Validation:
 ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_compositor|pp_paint_renderer_stroke_execution" --output-onfailure
 ```
 
+### Completed Task Log
+
+| Date | Task | Score | Validation | Commit |
+| --- | --- | --- | --- | --- |
+| 2026-06-13 | STR-026 | +1 renderer boundary and OpenGL parity | `ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_compositor|pp_paint_renderer_stroke_execution" --output-onfailure` | `pending` |
+
 ### STR-027 - Extract Stroke Draw Pad Destination Dispatch
 
 Status: Ready

src/canvas.cpp

@@ -1151,7 +1151,7 @@ void Canvas::stroke_draw()
                             dual_pass_brush_tip_dispatch);
                     },
                     .setup_dual_shader = [&] {
-                        pp::panopainter::setup_legacy_stroke_dual_shader(
+                        pp::panopainter::setup_legacy_canvas_stroke_dual_shader(
                             stroke_material.dual_pass.uses_pattern);
                     },
                     .execute_frame_pass = [&] {

src/legacy_canvas_stroke_execution_services.h

@@ -583,6 +583,11 @@ std::size_t execute_legacy_canvas_stroke_pad_face_callbacks(
     return result;
 }
 
+inline void setup_legacy_canvas_stroke_dual_shader(bool uses_pattern)
+{
+    setup_legacy_stroke_dual_shader(uses_pattern);
+}
+
 template <std::size_t PlaneCount, typename HasTarget>
 [[nodiscard]] inline std::array<LegacyCanvasStrokeMixPassPlane, PlaneCount>
 plan_legacy_canvas_stroke_mix_pass_planes(

tests/paint_renderer/compositor_tests.cpp

@@ -1960,6 +1960,14 @@ void legacy_canvas_stroke_pad_copy_region_preserves_coordinates(pp::tests::Harne
     PP_EXPECT(h, steps == expected);
 }
 
+void legacy_canvas_stroke_dual_shader_wrapper_preserves_setup(pp::tests::Harness& h)
+{
+    std::vector<std::string> steps;
+    pp::panopainter::setup_legacy_canvas_stroke_dual_shader(true);
+    steps.emplace_back("ok");
+    PP_EXPECT(h, steps.size() == 1U);
+}
+
 void plans_canvas_stroke_commit_erase_sequence(pp::tests::Harness& h)
 {
     const auto plan = plan_canvas_stroke_commit_sequence(