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The aura-2-en model enforces a hard 2 000-character limit per request. Chapters routinely exceed this, producing 413 errors. GenerateAudio now splits the stripped text into ≤1 800-char chunks at paragraph → sentence → space → hard-cut boundaries, calls the API once per chunk, and concatenates the MP3 frames. Callers (runner, streaming handler) are unchanged. StreamAudioMP3/WAV inherit the fix automatically since they delegate to GenerateAudio.