Attributes can be deleted from frozen models

Attributes can be deleted from frozen models: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). While BaseModel. setattr checks self.model config.get('frozen', None) , delattr doesn't. I haven't actually run into this in practice, it was just something I noticed…

The task

While `BaseModel.__setattr__` checks `self.model_config.get('frozen', None)`, `__delattr__` doesn't. I haven't actually run into this in practice, it was just something I noticed while poking around, but it seems like a simple omission that users wouldn't expect.

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