Part 2: simulated machines to Pub/Sub, with store-and-forward

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Architecture: six asyncua OPC UA servers simulate 12 machines and are discovered by Akri. Telegraf subscribes to their tags over signed and encrypted OPC UA and publishes MQTT over mutual TLS to a single EMQX node. cert-manager issues the certificates. A rule in EMQX sends each message to the Pub/Sub topic plant-telemetry over outbound HTTPS, with a sink buffer that holds messages while the link is down. A checker pulls from a test subscription and verifies the order.