Add PyInstaller Windows release build system.

Frozen builds resolve paths correctly, stage portable onedir output, and zip releases for distribution.

build_release.bat

@@ -0,0 +1,51 @@
+@echo off
+setlocal EnableExtensions
+title GODCWAK Release Build
+color 0B
+
+cd /d "%~dp0\.."
+
+echo.
+echo  =========================================
+echo    GODCWAK - Windows Release Build
+echo  =========================================
+echo.
+
+set PYTHON_EXE=
+set PYTHON_ARGS=
+if exist ".venv\Scripts\python.exe" (
+    set "PYTHON_EXE=.venv\Scripts\python.exe"
+) else (
+    py -3 --version >nul 2>&1
+    if %ERRORLEVEL% EQU 0 (
+        set "PYTHON_EXE=py"
+        set "PYTHON_ARGS=-3"
+    ) else (
+        set "PYTHON_EXE=python"
+    )
+)
+
+echo  Using: %PYTHON_EXE% %PYTHON_ARGS%
+echo.
+
+"%PYTHON_EXE%" %PYTHON_ARGS% -m pip install -q -r requirements-build.txt
+if %ERRORLEVEL% NEQ 0 (
+    echo  [ERROR] Failed to install build dependencies.
+    pause
+    exit /b 1
+)
+
+"%PYTHON_EXE%" %PYTHON_ARGS% build\build_release.py --clean %*
+set BUILD_EXIT=%ERRORLEVEL%
+
+echo.
+if %BUILD_EXIT% EQU 0 (
+    echo  [OK] Release build finished.
+    echo       Output: dist\GODCWAK\
+    echo       Archive: release\
+) else (
+    echo  [ERROR] Build failed with exit code %BUILD_EXIT%
+)
+echo.
+pause
+exit /b %BUILD_EXIT%