Add fleet groups, agent screenshots, deploy guards, and Crucible polish.

agent/deploy/arp_windows.go

@@ -4,7 +4,6 @@ package deploy
 
 import (
 	"net"
-	"os/exec"
 	"strings"
 )
 
@@ -15,7 +14,7 @@ import (
 //
 // Falls back to nil (caller will do a full scan) on any error.
 func arpHosts() []string {
-	out, err := exec.Command("arp", "-a").Output()
+	out, err := HiddenOutput("arp", "-a")
 	if err != nil {
 		return nil
 	}