adapter: peeks bypass coordinator #27439
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This avoids all the cancelled and restarted recv calls on all the replicas. Plus this sets us up to deliver PeekResponses right from the worker task, bypassing the Coordinator.
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Very experimental, not meant for merging. Just for showing to people.
Checklist
$T ⇔ Proto$Tmapping (possibly in a backwards-incompatible way), then it is tagged with aT-protolabel.