Jury instructions issued in a 2009 first-degree murder case by a newly appointed member of the Supreme Judicial Court were declared faulty yesterday by her new colleagues in a narrow decision that has prosecutors weighing their options.Geraldine Hines, who was elevated to the state’s highest court earlier this month, failed to instruct jurors when she was a Superior Court judge that they could consider Mario Gonzalez’s “consumption of alcohol” when deciding whether he murdered his girlfriend, Luz Forty, in a “cruel or atrocious manner.”