Share retained stroke face sample dispatch

docs/modernization/debt.md

@@ -33,6 +33,11 @@ agent or engineer to remove them without reconstructing context from chat.
   final plane draw ordering through `execute_legacy_canvas_stroke_mix_pass(...)`;
   mixer framebuffer/state setup and per-plane shader material/MVP preparation
   remain retained in `Canvas`.
+- 2026-06-13: DEBT-0036 was narrowed again. `Canvas::stroke_draw_samples()`
+  now routes face-indexed destination bind/copy/unbind and brush upload/draw
+  through `execute_legacy_canvas_stroke_face_sample_polygon(...)`; the
+  retained sample executor owns the face-aware dispatch contract while
+  `Canvas` keeps only concrete GL object callbacks.
 - 2026-06-13: DEBT-0036 was narrowed again. `NodeStrokePreview::stroke_draw_mix()`
   now routes mixer framebuffer bind/unbind, viewport/scissor/blend state,
   texture-slot binding, and final plane draw through one local helper;