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Public Access
Attributed to the admin doing the adding rather than a new system/bot sender concept, since every message today requires a real user_id and the admin is already a real, in-scope user for the request. Broadcasts room_added before the welcome message itself, so the new member's client learns the room exists before it sees an unread update for it. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>