Add Windows generated project cleanup script

Scripts/CleanGenerated-Windows.bat

@@ -0,0 +1,29 @@
+@echo off
+setlocal
+
+set "PROJECT_DIR=%~dp0.."
+set "PROJECT_FILE=%PROJECT_DIR%\AgrarianGame.uproject"
+
+echo Checking project file for stale VisualStudioTools plugin reference...
+findstr /I /C:"VisualStudioTools" "%PROJECT_FILE%" >nul
+if "%ERRORLEVEL%"=="0" (
+  echo.
+  echo ERROR: AgrarianGame.uproject still contains VisualStudioTools.
+  echo Run git pull again, or discard local changes to AgrarianGame.uproject.
+  echo.
+  pause
+  exit /b 1
+)
+
+echo Cleaning generated Unreal project folders...
+if exist "%PROJECT_DIR%\.vs" rmdir /s /q "%PROJECT_DIR%\.vs"
+if exist "%PROJECT_DIR%\Binaries" rmdir /s /q "%PROJECT_DIR%\Binaries"
+if exist "%PROJECT_DIR%\Intermediate" rmdir /s /q "%PROJECT_DIR%\Intermediate"
+if exist "%PROJECT_DIR%\DerivedDataCache" rmdir /s /q "%PROJECT_DIR%\DerivedDataCache"
+
+echo.
+echo Clean complete. Regenerate Visual Studio project files if needed, then run:
+echo %PROJECT_DIR%\Scripts\BuildEditor-Windows.bat
+echo.
+pause
+exit /b 0