docs(index): OtOpcUa — #521 host connectivity now consumed via telemetry; #522 tier machinery deleted
Both were recorded as open keep-or-delete decisions; both closed on OtOpcUa master abda6f9e. Neither changes the OPC UA wire contract, so neither is consumer-facing to ScadaBridge — but the index asserted them as current state, so it would have drifted. Claude-Session: https://claude.ai/code/session_015p7wGqy3YpZNCpDzTpGMKo
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