Extract cloud download thread launcher

docs/modernization/debt.md

@@ -18,6 +18,12 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-15: `DEBT-0038` was narrowed again. The retained cloud download
+  thread launch in `LegacyCloudServices::start_download()` now routes through
+  a focused helper in `src/legacy_cloud_services.cpp` instead of living
+  inline in the retained service method; the remaining cloud bridge debt stays
+  concentrated in retained prompt/progress lifetime, OpenGL context guarding,
+  and the still-retained transfer-thread execution model.
 - 2026-06-15: `DEBT-0038` was narrowed again. The retained cloud browser
   dialog creation path in `LegacyCloudServices::show_browser()` now routes
   through a focused helper in `src/legacy_cloud_services.cpp` instead of

docs/modernization/roadmap.md

@@ -177,6 +177,11 @@ The retained cloud browser dialog creation path in
 in `src/legacy_cloud_services.cpp`, so the remaining cloud bridge debt is
 further concentrated on retained prompt/progress lifetime, OpenGL context
 guarding, and the still-retained transfer-thread execution model.
+The retained cloud download thread launch in
+`LegacyCloudServices::start_download()` now also routes through a focused
+helper in `src/legacy_cloud_services.cpp`, so the remaining cloud bridge debt
+is further concentrated on retained prompt/progress lifetime, OpenGL context
+guarding, and the still-retained transfer-thread execution model.
 
 Recent 2026-06-13 retained preview reductions continue to narrow DEBT-0036:
 `NodeStrokePreview::draw_stroke_immediate()` now also routes

docs/modernization/tasks.md

@@ -1016,6 +1016,40 @@ Completed Task Log:
 | Date | Task | Score | Validation | Commit |
 | --- | --- | ---: | --- | --- |
 | 2026-06-15 | ADP-026 | 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` | `2e520709` |
+
+### ADP-027 - Extract Cloud Download Thread Launcher
+
+Status: Done
+Score: no score movement
+Debt: `DEBT-0038`
+Scope: `src/legacy_cloud_services.cpp` only
+
+Goal:
+
+Reduce the inline retained cloud download thread-launch surface by extracting
+the launch path from `LegacyCloudServices::start_download()` into a focused
+helper while preserving current behavior.
+
+Done Checks:
+
+- The retained cloud download thread launch path no longer lives inline in
+  `LegacyCloudServices::start_download()`.
+- The retained cloud download thread launch 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-007 | +1 legacy adapter retirement | `ctest --preset desktop-fast --build-config Debug -R "pp_app_core_app_dialog\|pp_ui_core_node_lifetime\|pp_ui_core_overlay_lifetime" --output-on-failure`; `ctest --preset desktop-fast --build-config Debug -R "pp_app_core_main_toolbar" --output-on-failure`; `MSBuild.exe out\build\windows-msvc-default\tests\pp_app_core_main_toolbar_tests.vcxproj /p:Configuration=Debug /p:Platform=x64`; `MSBuild.exe out\build\windows-msvc-default\panopainter_app.vcxproj /p:Configuration=Debug /p:Platform=x64` | `8db859cb` |
 
 ### RND-001 - Make Pure Equirectangular Export The Primary Success Path

src/legacy_cloud_services.cpp

@@ -176,6 +176,15 @@ void execute_cloud_download_thread(
     pp::panopainter::close_legacy_dialog_node(*m);
 }
 
+void launch_cloud_download_thread(
+    App& app,
+    const pp::app::CloudDownloadRequest& request)
+{
+    std::thread([app = &app, request] {
+        execute_cloud_download_thread(*app, request);
+    }).detach();
+}
+
 void execute_cloud_publish_worker(App& app, bool save_before_upload)
 {
     BT_SetTerminate();
@@ -318,10 +327,7 @@ public:
 
     void start_download(const pp::app::CloudDownloadRequest& request) override
     {
-        auto* app = &app_;
+        launch_cloud_download_thread(app_, request);
-        std::thread([app, request] {
-            execute_cloud_download_thread(*app, request);
-        }).detach();
     }
 
 private: