Record draw merge temporary paint cleanup

docs/modernization/roadmap.md

@@ -3231,6 +3231,10 @@ Results:
   `draw_checkerboard` parameter from the internal branch wrapper, shrinking the
   remaining call-shape mismatch while the blocked draw-merge extraction still
   stays in `STR-016`.
+- `Canvas::draw_merge_temporary_paint_branch()` now drops the unused
+  `draw_checkerboard` parameter from the temporary-paint wrapper, shrinking the
+  remaining draw-merge helper mismatch while the blocked extraction still stays
+  in `STR-016`.
 - Canvas main-brush, dual-brush, and stroke-pad draw paths now use the tested
   `pp_paint_renderer` stroke-feedback plan to decide whether framebuffer fetch
   supplies destination color or the legacy OpenGL path must copy the target