Make B-roll Talking Head

MEDIUM W011: Third-party content exposure detected (indirect prompt injection risk).

• Third-party content exposure detected (high risk: 0.75). The required workflow ingests user-supplied broll_video_url (and optionally audio_url/subtitles) as readable media text/metadata at runtime via the mcp__agent-media__make_broll_talking_head tool, and those URLs are outsider-authored content not chosen by the operating user beyond providing the link.