Improve safety and CLI fidelity for everyday use

Drop default --noconfirm (opt-in via --noconfirm), fix --noremovemake,
forward pacman argv intact for -R/-D/-F/-T/-U, deepen PKGBUILD review,
show an install plan before building, and add shellcheck CI plus unit tests.

Co-authored-by: Frank Vitrano <WHC2006@users.noreply.github.com>

config/miaur.conf.example

@@ -10,6 +10,7 @@ CleanAfter = false
 RemoveMake = true
 BottomUp = false
 SudoLoop = true
+Noconfirm = false
 
 # MFlags = -si
 # SortBy = votes