Isolate legacy stroke edge shader setup

docs/modernization/debt.md

@@ -18,6 +18,12 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-12: DEBT-0036 was narrowed again. Canvas stroke padding and commit
+  dilate shader setup now route retained `kShader::StrokePad` and
+  `kShader::StrokeDilate` binding/uniform writes through
+  `legacy_canvas_stroke_edge_services.h`. Quad expansion, dirty-box policy,
+  texture/framebuffer binding and copies, and draw ordering remain retained
+  legacy execution.
 - 2026-06-12: DEBT-0036 was narrowed again. Canvas live draw-merge and
   `NodeStrokePreview` final stroke composite `kShader::CompDraw` setup now
   share `legacy_canvas_stroke_composite_services.h` for retained shader binding

docs/modernization/roadmap.md

@@ -1350,9 +1350,11 @@ OpenGL stroke execution service seam. Live stroke `kShader::Stroke` binding,
 setup, blend, pattern, and per-sample uniform writes now pass through
 `legacy_canvas_stroke_shader_services.h`. Live draw-merge and preview final
 stroke composite `kShader::CompDraw` setup now pass through
-`legacy_canvas_stroke_composite_services.h`, leaving RTT/texture ownership,
-dirty-box policy, pad/checkerboard/commit composite shaders, and retained
-callback execution under `DEBT-0036`.
+`legacy_canvas_stroke_composite_services.h`. Stroke padding and commit dilate
+`kShader::StrokePad`/`kShader::StrokeDilate` setup now pass through
+`legacy_canvas_stroke_edge_services.h`, leaving RTT/texture ownership,
+dirty-box policy, checkerboard/commit composite shaders, quad expansion, and
+retained callback execution under `DEBT-0036`.
 It also owns renderer API texture-format to
 OpenGL internal/pixel/component token mapping, including depth-stencil formats,
 for future backend texture objects. `Texture2D` 2D texture binding, upload,