docs(index): OtOpcUa v3.0 — dual-namespace address space (PR #472 merged)
Update the OtOpcUa umbrella entry for v3.0: the single .../ns namespace is replaced by .../raw (s=<RawPath>) + .../uns (s=<Area>/<Line>/<Equipment>/<Eff>), single-source fan-out to both NodeIds, Organizes UNS->Raw, writes/HistoryRead via either NodeId, multi-notifier alarms, EquipmentNodeIds retired. Flags the wire- contract change as a pending ScadaBridge Data-Connection-Layer cutover. Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox
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