Function parse_matrix_rows_parallel 

pub fn parse_matrix_rows_parallel(
    batch: &MatrixRowBatch<'_>,
    header: &Header,
    limits: &Limits,
    counters: &AtomicSecurityCounters,
) -> HedlResult<Vec<Node>>

Parse matrix rows in parallel.

Each row is parsed independently without shared mutable state. Returns parsed nodes without ID registration (done sequentially after).