Function compile_epistemic_gpu_split_execution_with_stats_snapshot 

pub fn compile_epistemic_gpu_split_execution_with_stats_snapshot(
    program: &Program,
    stats_snapshot: Option<&StatsSnapshot>,
) -> Result<EpistemicSplitExecutablePlan>

Compile valid epistemic split components with an optional production stats snapshot.

Each component subprogram is lowered through compile_epistemic_gpu_execution_with_stats_snapshot, so split execution reuses the same GPU contract, reduced compiler pipeline, WCOJ promotion, and helper-splitting surfaces as unsplit epistemic execution.