processPeerings now takes the accumulated AS-path map under the lock and
replaces it with a fresh empty one, so each path is processed once and the
map never grows past a single 30-second interval's traffic. HandleMessage
stops adding new paths once maxTrackedPaths (500000) is reached and counts
the drops, which are logged with each run. The 30-minute prune and its
ticker are removed as dead code under the swap, and the map mutex drops
from RWMutex to Mutex since the read path is gone. RecordPeering already
upserts last_seen, so stored peerings are unchanged.
Model: opus-4-8
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