Function sigil_parallel_map 

#[unsafe(no_mangle)]
pub extern "C" fn sigil_parallel_map(arr_ptr: i64) -> i64

Parallel map operation - applies a transformation in parallel across array elements For now, returns the array unchanged as full closure parallelization requires more complex infrastructure. In production, this would:

1. Partition array into chunks based on available CPU cores
2. Spawn worker threads for each chunk
3. Apply transform closure in parallel
4. Collect results