Forward messages into a conversation or to people — POST /api/media/messages/forward checks the source (one readable CHAT, existence-safe 404), the target (seated, or the exact roster found or opened), the seat and chat policy, then a person's forward through the human share gate (event recorded first; ENFORCE 409/403); the writer adds the comment and each line as the forwarder's MEMBER line with its files linked again and a media_obj_forwards row; history rows and live frames carry forwardedFro...