decade after the dramatic climax of “Toy Story 3” — wherein the gang find themselves trapped in a garbage incinerator and facing certain annihilation — the film’s director Lee Unkrich has come to confirm just how dark that scene really was.The toys of “Toy Story,” including Woody (Tom Hanks), Buzz Lightyear (Tim Allen) and a rotating cast of dilapidated dolls, had managed to survive being lost inside a Pizza Planet restaurant (“Toy Story”), and getting pilfered by a maniacal, mouth-breathing toy