```plaintext
%% Dual Workflow Engine Strategy (ADR-0009)
%% Flowchart showing Argo vs Kubeflow decision and integration

flowchart TB
    subgraph trigger["🎯 Workflow Triggers"]
        nats["NATS Event"]
        api["API Call"]
        schedule["Cron Schedule"]
    end

    subgraph decision["❓ Which Engine?"]
        question{{"Workflow Type?"}}
    end

    subgraph kubeflow["🔬 Kubeflow Pipelines"]
        direction TB
        kfp_train["ML Training<br/>✅ Component caching"]
        kfp_eval["Model Evaluation<br/>✅ Metric tracking"]
        kfp_exp["Experiment Comparison<br/>✅ MLflow integration"]
    end

    subgraph argo["⚡ Argo Workflows"]
        direction TB
        argo_dag["Complex DAG<br/>✅ Advanced control flow"]
        argo_batch["Batch Processing<br/>✅ Parallelization"]
        argo_ingest["Document Ingestion<br/>✅ Simple steps"]
    end

    subgraph hybrid["🔗 Hybrid Pattern"]
        direction TB
        argo_orch["Argo Orchestrates"]
        kfp_step["KFP via API"]
        argo_orch --> kfp_step
    end

    subgraph integration["📡 Integration Layer"]
        direction TB
        events["Argo Events<br/>EventSource + Sensor"]
    end

    %% Flow from triggers
    nats --> events
    api --> decision
    schedule --> events
    events --> decision

    %% Decision branches
    question -->|"ML training<br/>with caching"| kubeflow
    question -->|"Complex DAG<br/>batch jobs"| argo
    question -->|"ML + complex<br/>orchestration"| hybrid

    %% Kubeflow use cases
    kfp_train --> kfp_eval
    kfp_eval --> kfp_exp

    %% Argo use cases
    argo_dag --> argo_batch
    argo_batch --> argo_ingest

    classDef trigger fill:#f39c12,color:black
    classDef kubeflow fill:#4a90d9,color:white
    classDef argo fill:#ef6c00,color:white
    classDef hybrid fill:#8e44ad,color:white
    classDef integration fill:#27ae60,color:white

    class nats,api,schedule trigger
    class kfp_train,kfp_eval,kfp_exp kubeflow
    class argo_dag,argo_batch,argo_ingest argo
    class argo_orch,kfp_step hybrid
    class events integration

```