Route NodeCanvas erase 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-erase
+  `CompErase` shader setup now routes through
+  `legacy_canvas_stroke_erase_services.h`; the retained node path still owns
+  per-onion-frame alpha updates, texture binding, temporary erase texture
+  selection, and draw execution.
 - 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

docs/modernization/roadmap.md

@@ -3005,6 +3005,10 @@ Results:
   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.
+- `NodeCanvas` live temporary-erase drawing now uses a retained stroke erase
+  shader setup helper for `CompErase` uniforms, while keeping per-onion-frame
+  alpha updates, texture binding, temporary erase 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