minor config refactor and management IP

internal/machine/network/ip.go

@@ -12,8 +12,9 @@ func MachineIP(subnet netip.Prefix) netip.Addr {
 	return subnet.Masked().Addr().Next()
 }
 
-// PeerIPv6 returns the IPv6 address of a peer derived from the first 14 bytes of its public key.
-func PeerIPv6(publicKey secret.Secret) netip.Addr {
+// ManagementIP returns the IPv6 address of a peer derived from the first 14 bytes of its public key.
+// This address is intended for cluster management traffic.
+func ManagementIP(publicKey secret.Secret) netip.Addr {
 	bytes := [16]byte{0xfd, 0xcc}
 	copy(bytes[2:], publicKey[:14])
 	return netip.AddrFrom16(bytes)