feat: add min_slot filter to selectPeer with fallback#950
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Motivation
Peers reporting
head_slot=0are either freshly connected (no status exchanged yet) or genuinely empty. Routingblocks_by_rootrequests to them wastes a round-trip and a timeout cycle.Description
min_slotparameter toselectPeerExcludingthat filters out peers whose last-knownhead_slotis below the thresholdhead_slot=0selectPeerCopy,selectPeer, andselectPeerExcludingonNetworknullto preserve current behaviorCloses #911
Related: #909