Extract cloud download thread helper

docs/modernization/tasks.md

@@ -696,6 +696,41 @@ Completed Task Log:
 | --- | --- | ---: | --- | --- |
 | 2026-06-15 | ADP-017 | no score movement | `MSBuild.exe out\build\windows-msvc-default\panopainter_app.vcxproj /p:Configuration=Debug /p:Platform=x64`; `ctest --preset desktop-fast --build-config Debug -R "pp_app_core_document_cloud" --output-on-failure` | `9b6fe73a` |
 
+### ADP-018 - Extract Cloud Download Thread Helper
+
+Status: Done
+Score: no score movement
+Debt: `DEBT-0038`
+Scope: `src/legacy_cloud_services.cpp` only
+
+Goal:
+
+Reduce the inline retained cloud-download worker surface by extracting the
+detached `LegacyCloudServices::start_download()` thread body into a focused
+helper while preserving current behavior.
+
+Done Checks:
+
+- The detached cloud-download worker body no longer lives inline in
+  `LegacyCloudServices::start_download()`.
+- The retained download-thread execution path now routes through a focused
+  helper in `src/legacy_cloud_services.cpp`.
+- `DEBT-0038` and the roadmap note the reduced remaining cloud bridge
+  surface.
+
+Validation:
+
+```powershell
+& 'C:\Program Files\Microsoft Visual Studio\18\Community\MSBuild\Current\Bin\MSBuild.exe' out\build\windows-msvc-default\panopainter_app.vcxproj /p:Configuration=Debug /p:Platform=x64
+ctest --preset desktop-fast --build-config Debug -R "pp_app_core_document_cloud" --output-on-failure
+```
+
+Completed Task Log:
+
+| Date | Task | Score | Validation | Commit |
+| --- | --- | ---: | --- | --- |
+| 2026-06-15 | ADP-018 | no score movement | `MSBuild.exe out\build\windows-msvc-default\panopainter_app.vcxproj /p:Configuration=Debug /p:Platform=x64`; `ctest --preset desktop-fast --build-config Debug -R "pp_app_core_document_cloud" --output-on-failure` | `(pending)` |
+
 Completed Task Log:
 
 | Date | Task | Score | Validation | Commit |