Use Win32 runtime binding for thread control

docs/modernization/roadmap.md

@@ -70,6 +70,10 @@ What is already real:
 - `pp_app_core`
 
 Latest slice:
+- `src/platform_windows/windows_runtime_shell.cpp` and
+  `src/platform_windows/windows_lifecycle_shell.cpp` now drive thread
+  start/stop through the explicit Windows runtime binding instead of routing
+  that control through `App::runtime()`.
 - `src/platform_windows/windows_platform_services.cpp` no longer brokers the
   Win32 main-thread queue through `bound_app()->runtime()`; it now uses an
   explicit Windows runtime binding.