Promote STR-011 preview main-pass task

docs/modernization/tasks.md

@@ -1023,6 +1023,33 @@ Completed Task Log:
 | --- | --- | ---: | --- | --- |
 | 2026-06-13 | STR-009 | +2 renderer boundary and OpenGL parity | `ctest --preset desktop-fast --build-config Debug -R "retained_stroke_commit_callback_builder_preserves_order|retained_stroke_commit_runner_preserves_per_face_step_order" --output-on-failure`; `& 'C:\Program Files\Microsoft Visual Studio\18\Community\MSBuild\Current\Bin\MSBuild.exe' out\build\windows-msvc-default\tests\pp_paint_renderer_compositor_tests.vcxproj /p:Configuration=Debug /p:Platform=x64` | `pending` |
 
+### STR-011 - Extract Preview Main Pass Orchestration
+
+Status: Ready
+Score: no score movement
+Debt: `DEBT-0036`
+Scope: `src/node_stroke_preview.cpp`, `tests/paint_renderer/compositor_tests.cpp`
+
+Goal:
+
+Extract the remaining `NodeStrokePreview::draw_stroke_immediate()` main-pass
+orchestration into a retained helper boundary without changing preview output.
+
+Done Checks:
+
+- Main-pass live execution uses a retained helper for setup, frame execution,
+  and final texture copy.
+- Preview regression coverage proves callback order and binding still match the
+  current behavior.
+- `DEBT-0036` records the narrowed preview orchestration surface.
+
+Validation:
+
+```powershell
+ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_compositor|pp_paint_renderer_stroke_execution" --output-on-failure
+cmake --build --preset windows-msvc-default --config Debug --target PanoPainter
+```
+
 ### STR-010 - Extract Remaining Draw Merge Composite Orchestration
 
 Status: Done