Share retained stroke sample dirty tracking

docs/modernization/debt.md

@@ -18,6 +18,11 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw` current and
+  dual live sample frame/face traversal plus dirty tracking now route through
+  `legacy_canvas_stroke_execution_services.h`; shader timing, sampler/texture
+  binding, framebuffer ownership, pad execution, and final OpenGL draw remain
+  retained in `Canvas`.
 - 2026-06-13: DEBT-0036 preview-adapter hardening grew again.
   `pp_paint_renderer_compositor_tests` now covers
   `legacy_node_stroke_preview_execution_services.h` framebuffer-feedback

docs/modernization/roadmap.md

@@ -3089,6 +3089,10 @@ Results:
   plus retained preview composite slot intent. Preview texture binding,
   framebuffer copies, mixer ownership, and final OpenGL draw ordering remain
   retained.
+- `Canvas::stroke_draw` current and dual live sample frame/face traversal plus
+  dirty tracking now share one retained stroke execution helper surface, while
+  shader timing, sampler/texture binding, framebuffer ownership, pad execution,
+  and final OpenGL draw ordering remain in the legacy Canvas path.
 - `Canvas::stroke_draw` pad-region planning now shares the retained stroke
   execution helper wrapping `pp_paint_renderer`, while pad color selection,
   dirty-face iteration, framebuffer copies, quad upload, and draw execution