docs(index): add the OtOpcUa Sql poll driver to the driver set
OtOpcUa merged a read-only Sql Equipment-kind driver to master 2026-07-24 (polls SQL Server → OPC UA variables; connectionStringRef env resolution, schema-walk address picker, live /run gate passed on docker-dev). Keep the umbrella index's OtOpcUa driver enumeration in sync per the propagation rule. Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
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