Function patch_seq_compress_zstd_level 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_compress_zstd_level(
    stack: Stack,
) -> Stack

Compress data using zstd with specified compression level

Stack effect: ( String Int – String Bool )

Level should be 1-22 (higher = better compression but slower). Returns base64-encoded compressed data and success flag.

Safety

Stack must have Int and String values on top