talking-head: one face, to camera, saying a short script

One person, framed chest-up, speaking words the user wrote. The portrait is the opening frame; the script is text in the prompt; the voice is generated.

This skill is a thin, scenario-specific layer over ofox-video-core. It owns the talking-head prompt craft, the brief, the defaults and the pre-generation cost estimate; ofox-video-core owns talking to the Ofox API correctly and safely (the OFOX_API_KEY handling, the no-resubmit rule, error-code mapping, download/verification, and reporting the downloaded file's absolute VIDEO_PATH). Read that skill's safety contract before using this one — it is not restated here.