Use consistent bash5 style for conditionals and quoting

install/config/mise-work.sh

@@ -10,7 +10,7 @@ EOF
 
 mise trust ~/Work/.mise.toml
 
-if [[ -n "${OMARCHY_CHROOT_INSTALL:-}" ]]; then
+if [[ -n ${OMARCHY_CHROOT_INSTALL:-} ]]; then
   NODE_TARBALL=$(find /opt/packages -name "node-v*-linux-x64.tar.gz" -type f 2>/dev/null | head -n1)
 
   NODE_VERSION=$(basename "$NODE_TARBALL" | sed 's/node-v\(.*\)-linux-x64.tar.gz/\1/')