Narrow stroke execution planning helpers

docs/modernization/roadmap.md

@@ -3073,6 +3073,12 @@ Results:
   `NodeCanvas` debug dirty bounds, atlas image drawing, and text drawing, while
   geometry, framebuffer flow, texture/sampler binding, blend/depth state,
   readback, and draw execution remain retained.
+- `Canvas::stroke_draw` face dirty-box planning now shares a retained stroke
+  execution helper wrapping `pp_paint_renderer`, retained stroke commit step
+  dispatch clamps malformed step counts to the fixed plan array, and
+  compositor coverage now includes malformed retained commit plans plus
+  all-input stroke-preview composite planning. Live stroke rasterization,
+  callback execution, texture binding, and history mutation remain retained.
 - Remaining simple color, hue, color-quad, grid heightmap, and pen/line
   preview shader setup in UI nodes and canvas modes now shares retained helper
   surfaces, while geometry, texture/sampler binding, blend/depth state,