perf: install env checks

script/install.d/98-clean.sh

@@ -5,22 +5,26 @@
 #   Clean up after installation.
 #
 
-if [[ "$OSTYPE" == "darwin"* ]]; then
-    brew cleanup
-elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    if command -v apt-get >/dev/null 2>&1; then
+case "$DOTS_PKG" in
+    brew)
+        brew cleanup
+        ;;
+    apt)
         sudo apt-get autoremove -qq
         sudo apt-get clean -qq
-    elif command -v pacman >/dev/null 2>&1; then
+        ;;
+    pacman)
         # Remove orphans if any (ignore error if none)
         if pacman -Qtdq >/dev/null 2>&1; then
             sudo pacman -Rns --noconfirm $(pacman -Qtdq) || true
         fi
         # Clear package cache without interactive prompt
         yes | sudo pacman -Scc >/dev/null 2>&1 || true
-    else
+        ;;
+    *)
         log_warn "Skipping cleanup: no supported package manager found"
-    fi
-fi
+        return 0
+        ;;
+esac
 
 log_pass "Cleanup completed successfully!"