1. A mobile computing device adapted to manage tasks across low-power wireless communications, the mobile computing device comprising: a processor; a memory; and a task manager stored in the memory and executable by the processor, wherein the task manager is configured to: identify one or more proximal computing devices in range of low-power wireless communications from the mobile computing device; detect a proximal task manager at at least one of the proximal computing devices, wherein the proximal task manager is adapted to manage performance of task operations on behalf of computing devices; exchange, via low-power wireless communications with the at least one proximal computing device, task management information with the at least one proximal computing device, the task management information comprising: identifications of task operations at the mobile computing device; identifications of task operations at the at least one proximal computing device; power supply information of the mobile computing device; and power supply information of the at least one proximal computing device; in response to determination, from exchanged power supply information, that a power supply of the mobile computing device has less available power than a power supply of the at least one proximal computing device, establish a mobile computing device role as a client computing device with respect to the at least one proximal computing device, wherein in the role as a client computing device, the mobile computing device is configured to: send, via low-power wireless communications with the at least one proximal computing device, an identification of one or more task operations, wherein the one or more task operations are associated with an energy consumption that exceeds an energy consumption associated with low-power wireless communications with the at least one proximal computing device; receive, via low-power wireless communications with the at least one proximal computing device, an acceptance of the one or more task operations; suspend the one or more task operations in response to the acceptance of the one or more task operations; and receive, via low-power wireless communications with the at least one proximal computing device, task result information produced from performance of the one or more task operations under management of the at least one proximal computing device; and in response to determination, from exchanged power supply information, that the power supply of the mobile computing device has more available power than the power supply of the at least one proximal computing device, establish a mobile computing device role as a server computing device with respect to the at least one proximal computing device, wherein in the role as a server computing device, the mobile computing device manages performance of task operations on behalf of the at least one proximal computing device.