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>

completions/miaur.zsh

@@ -17,6 +17,8 @@ _miaur() {
 		'--aur:use the AUR only'
 		'--repo:use repositories only'
 		'--skipreview:skip PKGBUILD review'
+		'--noremovemake:keep make dependencies'
+		'--noconfirm:bypass confirmation prompts'
 		'--bottomup:show AUR results first'
 		'--help:show help'
 	)