Route stroke frame planning through helper

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_compute`
+  frame planning now routes brush-quad construction, mixer feedback bounds,
+  2D/3D projection selection intent, and frame assembly through the retained
+  stroke execution helper; legacy projection geometry, stroke samples, and live
+  draw execution remain retained.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw` pad-region
   planning now routes through the retained stroke execution helper wrapping
   `pp_paint_renderer`; pad color selection, dirty-face iteration,

docs/modernization/roadmap.md

@@ -3083,6 +3083,10 @@ Results:
   execution helper wrapping `pp_paint_renderer`, while pad color selection,
   dirty-face iteration, framebuffer copies, quad upload, and draw execution
   remain retained.
+- `Canvas::stroke_draw_compute` frame planning now shares the retained stroke
+  execution helper for brush-quad construction, mixer feedback bounds, 2D/3D
+  projection selection intent, and frame assembly, while legacy projection
+  geometry, stroke samples, and live draw execution remain retained.
 - Remaining simple color, hue, color-quad, grid heightmap, and pen/line
   preview shader setup in UI nodes and canvas modes now shares retained helper
   surfaces, while geometry, texture/sampler binding, blend/depth state,