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>

lib/aur_rpc.sh

@@ -95,7 +95,7 @@ aur_print_info() {
 
 # Print search line for AUR result: aur/name version (votes) desc
 aur_format_search_line() {
-	local name=$1 ver=$2 votes=$3 pop=$4 desc=$5
+	local name=$1 ver=$2 votes=$3 desc=$5
 	local installed=
 	if is_pkg_installed "$name"; then
 		local localver