Is there a specification for the conditioning of cut wire to G1, G2 & G3? as nothing is defined in 2431/4

Look at these, I don't believe any will tell you how to condition the cut wire just what it should look like after it is performed. I would suggest you purchase your material pre-conditioned.

VDFI 8001, (DIN 8201-4), ISO 11124-1, AMS 2431-3, AMS 2431-8