Marketplace Notifications: One Key for Realtime Queues and Accurate Presence

<p>TL;DR: One key across realtime delivery and queues gives every stage a stable name for the same marketplace notification. That key does not make presence accurate, guarantee exactly-once delivery, or replace acknowledgements. It lets the system reconcile a presence decision, retry safely, and suppress the duplicate that otherwise appears when a buyer disconnects at the worst moment.</p> <div cl

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