optional winre and winre probe

Overlord-Client/cmd/agent/handlers/winre_stub.go

@@ -1,5 +1,5 @@
-//go:build !windows
-// +build !windows
+//go:build !windows || !overlord_winre
+// +build !windows !overlord_winre
 
 package handlers
 
@@ -11,9 +11,13 @@ import (
 )
 
 func handleWinREInstall(ctx context.Context, env *runtime.Env, cmdID string, filePath string, useSelf bool) error {
-	return fmt.Errorf("WinRE persistence is only supported on Windows")
+	return fmt.Errorf("WinRE persistence is not enabled on this client")
 }
 
 func handleWinREUninstall(ctx context.Context, env *runtime.Env, cmdID string) error {
-	return fmt.Errorf("WinRE persistence is only supported on Windows")
+	return fmt.Errorf("WinRE persistence is not enabled on this client")
+}
+
+func WinRESupported() bool {
+	return false
 }