I want the backend CLI to support --list backends as a standalone availability check, invoked as python…

I want the backend CLI to support --list backends as a standalone availability check, invoked as python…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). The report should start with RVE Backend Version: <version and end with Available Backends: ... . If PyTorch is…

The task

The report should start with `RVE Backend Version: <version>` and end with `Available Backends: [...]`. If PyTorch is importable, it should include `PyTorch Version: <version>`, append `pytorch (<device>)` to the available backend list, print each detected PyTorch device as `PyTorch GPU <index>: <name>`, and include…

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