feat: add system maintenance cleanup module

- Add broken preferences detection using plutil -lint validation
- Add broken login items cleanup (LaunchAgents pointing to missing files)
- Add universal binary slimming (opt-in via MOLE_SLIM_BINARIES=true)
- Protect Spotify cache if >500MB (likely contains offline music)
- Warn when browsers are running before cache cleanup
- All cleanup stats properly counted in final summary

bin/clean.sh

@@ -18,6 +18,7 @@ source "$SCRIPT_DIR/../lib/clean_dev.sh"
 source "$SCRIPT_DIR/../lib/clean_user_apps.sh"
 source "$SCRIPT_DIR/../lib/clean_system.sh"
 source "$SCRIPT_DIR/../lib/clean_user_data.sh"
+source "$SCRIPT_DIR/../lib/clean_maintenance.sh"
 
 # Configuration
 SYSTEM_CLEAN=false
@@ -832,6 +833,12 @@ perform_cleanup() {
     clean_time_machine_failed_backups
     end_section
 
+    # ===== 16. System maintenance =====
+    start_section "System maintenance"
+    # Broken preferences and login items cleanup (delegated to clean_maintenance module)
+    clean_maintenance
+    end_section
+
     # ===== Final summary =====
     echo ""