Function cmp_dict_str_to 

pub fn cmp_dict_str_to<'a, T: Integer, U: Integer>(
    lhs: CategoricalAVT<'a, T>,
    rhs: StringAVT<'a, U>,
    op: ComparisonOperator,
    output: &mut Bitmask,
) -> Result<(), KernelError>

Zero-allocation variant: writes directly to caller’s output buffer.

Compare UTF-8 string or dictionary arrays using the specified comparison operator. The output Bitmask must have capacity >= llen.