The Writers Guild of America has reached what union leaders are calling an “exceptional” tentative deal on a new contract with Hollywood studios and streaming services after a historic 146-day strike. The settlement follows stepped-up negotiations over the past week between the WGA and the Alliance of Motion Picture and Television Producers, capping months of stalled talks over compensation, residuals and protections against artificial intelligence. The writers’ breakthrough could give momentum to talks between SAG-AFTRA and Hollywood studios to end a strike by actors who walked off the job in July.