Function run_plan_command 

pub fn run_plan_command(
    config_path: &str,
    export_name: Option<&str>,
    params: Option<&HashMap<String, String>>,
    format: PlanOutputFormat,
) -> Result<()>

Entry point for rivet plan.

Iterates over all matching exports, builds a PlanArtifact for each, and either prints or saves it according to format.