decompress_karabina_bls12_381_compressed

Decompress a Karabina-compressed cyclotomic element back to E12T.

The implementation mirrors the two-step Karabina decompression and branches between the “I_Z” and “I_NZ” circuits depending on whether c1b2 == 0.

Fully qualified path: garaga::ec::pairing::single_pairing_tower::decompress_karabina_bls12_381_compressed

pub fn decompress_karabina_bls12_381_compressed(X: CompressedE12T) -> (E12T)