chore: import upstream snapshot with attribution

scripts/run-with-git-bash.cmd

@@ -0,0 +1,20 @@
+@echo off
+setlocal
+
+set "bash_exe="
+
+for /f "delims=" %%I in ('where git 2^>NUL') do (
+    if exist "%%~dpI..\bin\bash.exe" (
+        set "bash_exe=%%~dpI..\bin\bash.exe"
+        goto :found_bash
+    )
+)
+
+echo Could not locate Git for Windows Bash ("..\bin\bash.exe" relative to git on PATH). Ensure Git for Windows is installed and that git and bash.exe are available on PATH.
+exit /b 1
+
+:found_bash
+echo Detected Windows - using Git Bash...
+"%bash_exe%" %*
+set "cmd_rc=%ERRORLEVEL%"
+exit /b %cmd_rc%