Add stroke sampler dispatch helper coverage

docs/modernization/tasks.md

@@ -509,6 +509,11 @@ Done Checks:
 
 Progress Notes:
 
+- 2026-06-13: `pp_paint_renderer_stroke_execution_tests` now covers the new
+  retained sampler dispatch helper builder and its pattern bind/unbind wiring.
+  Next slice should target another narrow `stroke_draw()` seam or another
+  helper-builder regression without reopening landed texture or dual-pass
+  helpers.
 - 2026-06-13: `Canvas::stroke_draw()` live-pass sampler dispatch now reuses a
   retained helper builder for brush-tip, destination, pattern, and mixer
   sampler callbacks; the live adapter still owns the concrete sampler objects.