vasars2024-hub/blackroom ? reverse-engineered prompt

Build me a simple invite only anonymous chat room that runs over Tor, with no accounts, no database, no message history, and no build step.

I want people to open a room, share one invite code per person, and start talking in the browser. It should be end to end encrypted, use the browser’s built in crypto, and keep everything ephemeral so closing the tab makes it disappear. Make the join flow work with pasted invite text and QR codes too, since people may be moving the code between devices. Include a clear room preface, basic presence, and messages that feel private and temporary.

Please keep it as plain source files with zero npm dependencies, and make the relay runnable with Node 24 or newer. If you need to check current docs for browser APIs or Tor setup details, look them up online. Also make sure the app has the licence and security wording baked in, since this is meant to be a serious privacy focused release candidate.