routing,node: Kademlia table liveness and refresh (closes #21)#32
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- Table rows are TableEntry { id, ping_replied }; FINDNODE only lists ping_replied peers.
- RoutingTable.markPingReplied / pingReplied; last_bucket_lookup_ms with
markBucketRefreshed and pickStaleBucketForRefresh for periodic refresh.
- Handshake completion marks peers verified; registerOutboundPing + inbound PONG
matches spec PING correlation.
- Tests: ping_replied filter, stale bucket pick, pong registration path.
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Implements discv5-theory table maintenance pieces from issue #21.
Routing table
TableEntrywithping_replied;markPingReplied/pingReplied.appendNodesForLogDistancesonly includes verified peers (FINDNODE relay policy).last_bucket_lookup_ms,markBucketRefreshed,pickStaleBucketForRefreshfor periodic bucket refresh.Node
registerOutboundPing+ inbound PONG with matchingreq_idsetsping_replied(capped tracker).Tests
Follow-ups (not in this PR): LRU ping-before-replace when bucket full (needs address book), ENR update on PONG
enr_seq, full iterative lookup walk.