Thin app dialog and renderer adapter ownership

docs/modernization/debt.md

@@ -18,6 +18,26 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Reductions
 
+- 2026-06-17: `DEBT-0036` was narrowed again. `src/canvas_layer.cpp` now
+  routes retained `Layer` / `LayerFrame` render queueing through
+  `src/renderer_gl/render_runtime_dispatch.h` instead of direct
+  `App::I->render_task*` calls; retained `Canvas::I` draw-state use and the
+  broader canvas renderer execution remain.
+- 2026-06-17: `DEBT-0034` was narrowed again.
+  `LegacyAboutMenuServices::run_performance_test(...)` in
+  `src/legacy_app_shell_services.cpp` now delegates the retained stroke/timing
+  workflow to `src/legacy_app_shell_performance_test_services.*`, so the About
+  menu adapter no longer owns the inline render-task/canvas execution body.
+- 2026-06-17: `DEBT-0040`/`DEBT-0042` were narrowed again. `App::dialog_save()`
+  and `App::dialog_save_ver()` in `src/app_dialogs_workflow.cpp` now delegate
+  Save As / Save Version acceptance through
+  `src/legacy_document_session_services.*`, so the app dialog shell no longer
+  owns the retained plan/target lookup entrypoints for those save paths.
+- 2026-06-17: `DEBT-0047` was narrowed again. The desktop async PPBR export
+  path in `src/legacy_brush_package_export_services.cpp` now uses
+  `AppRuntime::canvas_async_task` plus named completion helpers instead of a
+  file-static worker singleton, while retained preset-panel execution and
+  dialog-owned request extraction still remain.
 - 2026-06-17: `DEBT-0036` was narrowed again. Retained `Shape`,
   `src/shader.cpp`, and `src/font.cpp` now queue render-thread create/update/
   destroy work through `src/renderer_gl/render_runtime_dispatch.h` instead of