Replace the EP-family wall-clock figure with the measured backprop ratiomain

The 0.4x figure compared relaxation-iteration counts across methods that count
different things: the closest EP-family baseline uses asynchronous local updates
where one iteration moves information roughly one layer, while ours transmits
through the whole stack per round. Wall-clock against backprop on matched
hardware is the currency that survives that difference, and it measures 2.7x.

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