docs(index): OtOpcUa's MQTT / Sparkplug B driver is merged to master
Merge c3a2b0f7, pushed to origin 2026-07-27. Supersedes the
"on branch feat/mqtt-sparkplug-driver, not yet merged" note in bf75e26.
Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
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