Function execute_pipeline_distributed 

pub fn execute_pipeline_distributed(
    plan: &PipelinePlan,
    token_count: usize,
    micro_batch: usize,
    config: TcpTransportConfig,
    cluster: &ClusterState,
    placement_context: Option<&PlacementPlan>,
    rebalance: Option<&RebalanceTrigger>,
) -> Result<ExecutionResult, String>

Execute pipeline stages distributed across the LAN using TCP transport.