Share retained stroke face framebuffer helper

docs/modernization/roadmap.md

@@ -3098,6 +3098,11 @@ Results:
   dual-pass dirty preservation, while shader timing, sampler/texture binding,
   framebuffer ownership, pad execution, and final OpenGL draw ordering remain
   in the legacy Canvas path.
+- `Canvas::stroke_draw` main and dual live-pass per-face framebuffer
+  bind/unbind execution now shares one retained helper, and pad-face array
+  assembly now shares one retained utility, while shader activation timing,
+  texture/sampler binding, framebuffer ownership, pad execution, and final
+  OpenGL draw ordering remain in the legacy Canvas path.
 - `Canvas::stroke_draw` pad-pass destination bind/copy/unbind ordering now
   shares the retained stroke execution helper callback surface, while shader
   setup, pad color selection, framebuffer ownership, and final OpenGL draw