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KKRainbow
636390ec38
* feat(peer): echo liveness probes on data traffic Advertise a liveness-echo capability during classic and Noise handshakes. After a ping failure, tag outgoing peer packets with a short probe token and accept only the matching echoed token as round-trip proof. Keep one ping request outstanding and coalesce scheduler triggers so high traffic cannot reorder timeout results. Preserve one-way failure detection because unrelated ingress never clears the loss counter. * test(three_node): relax disconnect wait for sequential pingpong proxy_three_node_disconnect_test assumed the old pingpong timing, where overlapping pings failed fast and the connection closed well inside the 11s wait (see the old [4, 9)s comment). The liveness-echo change keeps one ping outstanding: each failure now takes a full 2s timeout, so the fifth consecutive failure and the connection close land at ~11s. Both proto variants timed out at the 11s bound in CI. Widen the wait to 15s and update the timing comment.