Function split_batch 

pub fn split_batch(
    smiles: &[String],
    n_workers: usize,
    seed: u64,
) -> Vec<WorkerTask>

Split a batch of SMILES into N worker tasks.

smiles: all SMILES to process n_workers: number of workers to distribute across seed: RNG seed

Each chunk is capped at 10 000 SMILES to prevent unbounded memory allocation when few workers are requested for very large inputs.

Returns a vector of tasks, one per worker.