Function compile_epistemic_gpu_execution_with_stats_snapshot 

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

Compile an epistemic program with an optional production statistics snapshot.

This preserves the reduced ordinary-body planner contract: cardinality, selectivity, access heat, prefix-degree, sorted-layout, and helper-splitting decisions are owned by the existing production compiler pipeline rather than by an epistemic side planner.