Function column_major_to_row_major 

pub fn column_major_to_row_major<F: PrimeField>(
    trace: &ColumnMajorTrace<F>,
) -> RowMajorTrace<F>

Transpose a column-indexed trace into a row-indexed trace.

result[row][col] = trace[col].evaluations[row].clone(). Used by the MLE-first prover when it needs to fall back to the row-major evaluate_for_constraints path for non-linear constraints.