Refine stroke mix pass boundary

docs/modernization/tasks.md

@@ -509,6 +509,14 @@ Done Checks:
 
 Progress Notes:
 
+- 2026-06-13: `Canvas::stroke_draw_mix()` now routes mix-pass plane planning
+  through `plan_legacy_canvas_stroke_mix_pass_planes(...)` and wraps retained
+  framebuffer setup/teardown with
+  `execute_legacy_canvas_stroke_mix_pass_with_setup(...)`; the live adapter
+  still owns concrete sampler, texture, and draw callbacks. `pp_paint_renderer_stroke_execution_tests`
+  now covers the default dirty-union path for live-pass face-framebuffer
+  execution. Next slice should target the remaining Canvas stroke execution
+  seam without reopening the landed mix-pass setup helper.
 - 2026-06-13: `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(...)`; per-layer iteration,