Handle minikube exit code 89

Handle minikube exit code 89: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Minikube has well-defined exit codes, and Skaffold has special handling for turning minikube exit codes into actionable errors. This code needs to be updated as it's not handling minikube exit code…