Nov 5 (Reuters) - Big tech stocks slumped Thursday, putting them on track for their biggest decline since the "Liberation Day" rout last year, the most significant shakeout yet in what has been a punishing autumn for the AI trade. By Niket Nishant and Caroline Valetkevitch Nov 5 (Reuters) - Big tech stocks slumped Thursday, putting them on track for their biggest decline since the "Liberation Day" rout last year, the.