Record STR-047 closeout hash

docs/modernization/tasks.md

@@ -2053,7 +2053,7 @@ ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_composito
 
 ### STR-047 - Extract Draw Merge Final Composite Gating
 
-Status: Ready
+Status: Done
 Score: no score movement
 Debt: `DEBT-0036`
 Scope: `src/canvas.cpp`, `src/legacy_canvas_draw_merge_services.h`, `tests/paint_renderer/compositor_tests.cpp`
@@ -2073,6 +2073,8 @@ Done Checks:
 - `docs/modernization/debt.md` records the reduced draw-merge final-composite
   surface.
 
+Closeout: `a16ac39d`
+
 Validation:
 
 ```powershell