Narrow retained stroke preview execution

docs/modernization/debt.md

@@ -18,6 +18,12 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-13: DEBT-0036 preview-adapter hardening grew again.
+  `pp_paint_renderer_compositor_tests` now covers
+  `legacy_node_stroke_preview_execution_services.h` framebuffer-feedback
+  fallback clamping plus retained preview composite slot intent, while live
+  preview sample execution, mixer passes, texture binding, and final draw
+  ordering remain retained.
 - 2026-06-13: DEBT-0036 was narrowed again. `NodeStrokePreview::stroke_draw_compute`
   now routes preview quad frame planning through
   `legacy_canvas_stroke_execution_services.h`. Preview stroke sampling, mixer

docs/modernization/roadmap.md

@@ -3082,6 +3082,13 @@ Results:
 - `NodeStrokePreview::stroke_draw_compute` now shares the retained stroke
   execution helper for preview quad frame planning. Preview sample execution,
   mixer passes, texture binding, and final draw ordering remain retained.
+- `NodeStrokePreview` preview stroke frame sequencing now shares one retained
+  local executor for dual and main preview sample traversal, and
+  `pp_paint_renderer_compositor_tests` now covers
+  `legacy_node_stroke_preview_execution_services.h` feedback fallback clamping
+  plus retained preview composite slot intent. Preview texture binding,
+  framebuffer copies, mixer ownership, and final OpenGL draw ordering remain
+  retained.
 - `Canvas::stroke_draw` pad-region planning now shares the retained stroke
   execution helper wrapping `pp_paint_renderer`, while pad color selection,
   dirty-face iteration, framebuffer copies, quad upload, and draw execution