Extract pad stroke face orchestration

docs/modernization/debt.md

@@ -86,9 +86,10 @@ agent or engineer to remove them without reconstructing context from chat.
   `execute_legacy_canvas_stroke_main_pass_frame_callbacks(...)`; the retained
   path still owns the concrete shader, sampler, and framebuffer wiring.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw()` pad-face
-  orchestration remains retained and is next targeted for helper extraction;
-  pad destination dispatch already routes through a retained helper, but the
-  pad face loop and copy timing still live in `Canvas`.
+  orchestration now routes through
+  `execute_legacy_canvas_stroke_pad_face_callbacks(...)`; the retained path
+  still owns the concrete brush shape, destination dispatch, and framebuffer
+  wiring.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw_samples()`
   now routes polygon triangulation, sample-point assembly, and retained
   destination-copy / upload / draw helper handoff through