update build scripts

scripts/build.cmd

@@ -1,23 +1,9 @@
 @echo off
-REM Local build-only test script for Windows.
-REM Compiles the project WITHOUT uploading to any device.
-REM Usage: scripts\build.cmd
-
 setlocal
 cd /d "%~dp0\.."
-
 set VENV_DIR=.venv-platformio
-
-REM Prefer the "py" launcher (ships with official Python installer) which
-REM reliably picks Python 3, even if "python" on PATH points to an old
-REM Python 2.x install.
 where py >nul 2>nul
-if %errorlevel%==0 (
-    set PYTHON_CMD=py -3
-) else (
-    set PYTHON_CMD=python
-)
-
+if %errorlevel%==0 (set PYTHON_CMD=py -3) else (set PYTHON_CMD=python)
 if not exist "%VENV_DIR%" (
     echo Creating local virtualenv in %VENV_DIR% using: %PYTHON_CMD%
     %PYTHON_CMD% -m venv "%VENV_DIR%"
@@ -25,21 +11,13 @@ if not exist "%VENV_DIR%" (
         echo.
         echo ERROR: Could not create a Python 3 virtualenv.
         echo Make sure Python 3 is installed from https://www.python.org/downloads/
-        echo and that "py -3 --version" or "python --version" reports Python 3.x
-        echo ^(your "python" currently points to: %PYTHON_CMD%^)
         exit /b 1
     )
     "%VENV_DIR%\Scripts\python.exe" -m pip install --upgrade pip
     "%VENV_DIR%\Scripts\pip.exe" install platformio
 )
-
 echo Running build (no upload) ...
 "%VENV_DIR%\Scripts\pio.exe" run
-
-if errorlevel 1 (
-    echo Build FAILED.
-    exit /b 1
-)
-
+if errorlevel 1 (echo Build FAILED. & exit /b 1)
 echo Build finished successfully.
 endlocal