Extract stroke commit callback orchestration

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_commit()` now
+  builds its retained callback table through
+  `make_legacy_canvas_stroke_commit_callbacks(...)`; the legacy executor still
+  owns ordering, history capture, and dilate sequencing, and the concrete
+  Canvas state wiring remains open in the legacy path.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::draw_merge()` now routes
   per-plane merge-target clear, blend-state gating, and optional checkerboard
   prepass through `execute_legacy_canvas_draw_merge_plane_setup(...)`;