I switch between a few different builders depending on the project I'm working on, and right now there's no…

I switch between a few different builders depending on the project I'm working on, and right now there's no…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Keep the behavior observable through the CLI and persisted pack configuration. Preserve existing pack…