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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…

The task

Keep the behavior observable through the CLI and persisted pack configuration. Preserve existing `pack config` behavior while adding the new default-builder management flow and trusted-builder aliases; command wiring, validation placement, helper names, and internal data organization are up to the implementation.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.