Drop dead Win32 retained key state

docs/modernization/roadmap.md

@@ -70,6 +70,9 @@ What is already real:
 - `pp_app_core`
 
 Latest slice:
+- `src/platform_windows/windows_window_shell.*` no longer carries the dead
+  retained raw key-state array or its accessor; Win32 key synchronization now
+  relies only on the virtual-key map plus `App` key state.
 - `linux/src/main.cpp` now binds and clears the FPS-title callback directly in
   the Linux entrypoint-owned shell; `App::set_platform_services()` no longer
   installs Linux-specific GLFW title behavior.