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Implement per-room message queue with per-agent watermarks so each agent in a Matrix room independently tracks which messages it has consumed. - Non-trigger messages accumulate in a shared per-room queue - When an agent is triggered, it receives InboundHistory of pending messages since its last reply (capped at historyLimit) - Watermark only advances to the snapshot taken at dispatch time, so messages arriving during async processing are visible on the next trigger (race safety) - Each agent has an independent watermark, so multiple agents in the same room see independent history windows Configure via channels.matrix.historyLimit (or messages.groupChat.historyLimit). Default is 0 (disabled, preserving existing behavior).