Function deterministic_run_id 

pub fn deterministic_run_id(
    domain: &str,
    size: usize,
    seed: u64,
    difficulty: &str,
    hard_neg_ratio: f64,
) -> String

Deterministic run ID derived from generation parameters, so the same (domain, size, seed, difficulty, hard_neg_ratio) always produces the same output filename regardless of output format (IPC vs Parquet) or how many times it’s run.