Route NodeCanvas stroke composite setup 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. `NodeCanvas` live temporary-stroke
+  `CompDraw` shader setup now routes through
+  `legacy_canvas_stroke_composite_services.h`; the retained node path still
+  owns per-onion-frame alpha updates, texture binding, temporary stroke texture
+  selection, and draw execution.
 - 2026-06-13: DEBT-0036 was narrowed again. `NodeStrokePreview` preview
   background checkerboard shader setup now routes through
   `legacy_canvas_draw_merge_services.h`, preserving the existing colorize

docs/modernization/roadmap.md

@@ -3001,6 +3001,10 @@ Results:
   draw-merge shader setup helper for checkerboard uniforms, preserving its
   colorize condition and preview MVP while leaving capture ordering, texture
   copies, stroke setup, and draw execution in the retained preview path.
+- `NodeCanvas` live temporary-stroke drawing now shares the retained stroke
+  composite shader setup helper for static `CompDraw` uniforms, while keeping
+  per-onion-frame alpha updates, texture binding, temporary stroke texture
+  selection, and draw execution in the retained node path.
 - `Canvas::stroke_draw_mix` now shares the retained stroke composite shader
   helper for mixer-pass `CompDraw` setup, while preserving its caller-specific
   texture slot uniforms. Mixer framebuffer/scissor state, sampler and texture