Simplify exit cleanup - one question, full cleanup

Changes:
- Single question on exit: 'Clean history and remove traces?'
- If yes: runs full trace eraser automatically
- Auto mode skips all prompts, removes everything
- TRACE_ERASER_AUTO=yes flag for non-interactive mode

User experience:
- Exit (0)
- One question
- If yes: everything cleaned and removed automatically
- No multiple prompts

launcher.sh

@@ -1504,13 +1504,11 @@ main() {
             10) bash "$BASE_DIR/tools/erase-toolkit-traces.sh" ;;
             0)
                 echo ""
-                echo -e "${YELLOW}Clean bash history before exiting?${NC}"
-                echo "This will remove all toolkit-related commands from history."
-                echo ""
-                read -p "Clean history? (yes/no): " clean_hist
+                read -p "Clean history and remove traces? (yes/no): " clean_hist
 
                 if [ "$clean_hist" = "yes" ]; then
-                    bash "$BASE_DIR/tools/erase-toolkit-traces.sh"
+                    # Run trace eraser in non-interactive mode
+                    TRACE_ERASER_AUTO=yes bash "$BASE_DIR/tools/erase-toolkit-traces.sh"
                 fi
 
                 echo ""