Use the business-file-assistant skill. Work only in examples/delays/input and write new results in examples/delays/output. Do not read expected files. Analyze activity.csv. Write result.json with stages sorted by waiting_minutes descending (stage, waiting_minutes, rework_minutes, record_ids), total_waiting_minutes, total_rework_minutes and limitations. Use local calculation tools and retain the script. Explain observed bottlenecks without inventing causes or savings.
