3cd2674f68
GitHub Actions shells are format strings; the bare 'msys2' string made the
v1.0.0 tag build fail before its first step ('Invalid shell option'). Same
invocation ci.yml already uses. path-type: inherit so the Package step can
reach the runner's 7z.exe.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>