Paid Gemini TTS audio for a finished blog post: summary, full read-aloud, or two-speaker dialogue, with an MP3 and an HTML5 embed. Asks for explicit consent before the first paid call. Runs only on an explicit request: /blog audio, "generate audio for this blog post", "narrate this blog post", "audio version of this post", or "podcast version of this post". Not for general speech or dictation questions.