Extract dual stroke face execution

docs/modernization/debt.md

@@ -71,6 +71,11 @@ agent or engineer to remove them without reconstructing context from chat.
   `execute_legacy_canvas_stroke_live_pass_with_face_framebuffers(...)`; the
   retained path still owns the concrete framebuffer array and per-face GL
   callbacks.
+- 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw()` dual-pass
+  face execution now routes through
+  `execute_legacy_canvas_stroke_dual_pass_frame_callbacks(...)`; the retained
+  path still owns the concrete dual-brush shader, sampler, 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