When a peer's hello is verified, send a gossip burst of currently
connected peers so the new peer can discover and connect to nodes it
hasn't met yet — without relying on the anchor for a full peer-join
notification for each one.
- mesh: add PendingConnect chan for gossip-discovered peer IDs
- peer: send gossip burst after hello; push unknown peers from incoming
gossip onto PendingConnect (skip self + already-connected)
- anchor: drain PendingConnect per runOnce, initiate startOffer for
unknown peers using the same lexicographic tiebreak as anchor join;
drain goroutine is scoped to the runOnce lifetime to avoid using stale
sessions after a reconnect
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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