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- Require an explicit port for L4 cluster targets. validateL4Target exempted TargetTypeCluster from the port check, but buildPathMappings serializes every L4 target via net.JoinHostPort(host, port) — port=0 shipped a ":0" upstream. Cluster targets use the same Host/Port fields, so the same requirement applies. - GetPeerByIP returns NotFound on a tunnel-IP miss instead of mapping every error to Internal. The proxy's ValidateTunnelPeer probes IPs that legitimately aren't in the roster; the miss is expected and now distinguishable from a real store failure. - Thread ctx into getClusterCapability's gorm query so a cancelled request doesn't keep the store busy. Tests updated for the L4-cluster port requirement and the GetPeerByIP NotFound path.