flowchart LR
    A[Synthetic monthly demand] --> B[Prepare dates and features]
    B --> C[Trimmed-mean baseline]
    B --> D[Gradient-boosting model]
    C --> E[Rolling validation]
    D --> E
    E --> F[Select by sMAPE]
    F --> G[12-month forecast]

    H[Manual trigger today] -.-> B
    I[Future Airflow boundary] -.-> B

    subgraph Delivery["Delivery ownership"]
      J[Business question] --> K[Reproducible evidence]
      K --> L[Review and adoption]
    end