Phase 7: add Windows .cmd equivalents for build/deploy scripts

scripts/build.cmd

@@ -0,0 +1,23 @@
+@echo off
+setlocal
+cd /d "%~dp0\.."
+set VENV_DIR=.venv-platformio
+where py >nul 2>nul
+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%"
+    if not exist "%VENV_DIR%\Scripts\python.exe" (
+        echo.
+        echo ERROR: Could not create a Python 3 virtualenv.
+        echo Make sure Python 3 is installed from https://www.python.org/downloads/
+        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)
+echo Build finished successfully.
+endlocal

scripts/deploy.cmd

@@ -0,0 +1,29 @@
+@echo off
+setlocal
+cd /d "%~dp0\.."
+set VENV_DIR=.venv-platformio
+where py >nul 2>nul
+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%"
+    if not exist "%VENV_DIR%\Scripts\python.exe" (
+        echo.
+        echo ERROR: Could not create a Python 3 virtualenv.
+        echo Make sure Python 3 is installed from https://www.python.org/downloads/
+        exit /b 1
+    )
+    "%VENV_DIR%\Scripts\python.exe" -m pip install --upgrade pip
+    "%VENV_DIR%\Scripts\pip.exe" install platformio
+)
+set PIO=%VENV_DIR%\Scripts\pio.exe
+if "%~1"=="" (
+    echo Auto-detecting upload port...
+    "%PIO%" run --target upload
+) else (
+    echo Using forced upload port: %~1
+    "%PIO%" run --target upload --upload-port %~1
+)
+if errorlevel 1 (echo Deploy FAILED. & exit /b 1)
+echo Build + flash complete.
+endlocal