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* fix(engine): a sharp sound in a film's first moments no longer grows louder with each audio pass Every AAC encode now starts in digital silence that is dropped afterwards. Opening cold on quiet sound, the native encoder coded the first loud frame three scalefactor steps hot (4.5 dB), and each re-encode (pad, true-peak correction) did it again. * fix(engine): AAC encodes stay in step with audio that is not 48 kHz before the encoder * test(producer): regression goldens for audio that now opens without the encoder's cold start