Last week we got Seedance 2.5 running on the official Ark channel, and since Chinese docs on this model are thin and English docs are thinner, here are the notes I wish someone had written before we started. The quick facts first. One async endpoint, model id `doubao-seedance-2.5-face`. Each request produces 4 to 30 seconds of video at 480p or 720p, MP4 or MOV out. Audio is generated in the same pass: speech, sound effects, background music. Spoken lines go inside double quotes in the prompt, e...