Promote stroke draw texture dispatch task

docs/modernization/tasks.md

@@ -573,6 +573,34 @@ Done Checks:
 - Retained stroke OpenGL execution is deleted or isolated as an OpenGL backend
   implementation.
 
+### STR-020 - Extract Stroke Draw Main Pass Texture Dispatch
+
+Status: Ready
+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`
+
+Goal:
+
+Move the inline `Canvas::stroke_draw()` main-pass texture dispatch bundle into
+a retained helper so the callsite keeps only branch selection plus concrete
+texture/sampler wiring.
+
+Done Checks:
+
+- `Canvas::stroke_draw()` no longer builds the main-pass texture dispatch
+  bundle inline.
+- Regression coverage proves the extracted helper preserves main-pass texture
+  callback order.
+- `docs/modernization/debt.md` records the reduced stroke-draw texture
+  dispatch surface.
+
+Validation:
+
+```powershell
+ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_compositor|pp_paint_renderer_stroke_execution" --output-on-failure
+```
+
 Progress Notes:
 
 - 2026-06-13: `NodeStrokePreview::draw_stroke_immediate()` now routes final