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Remove initialize() Method from LlamaStackAsLibrary

Remove initialize() Method from LlamaStackAsLibrary: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Remove the explicit initialize() method requirement from LlamaStackAsLibraryClient to improve developer experience and reduce the potential for initialization errors.

The task

Remove the explicit `initialize()` method requirement from `LlamaStackAsLibraryClient` to improve developer experience and reduce the potential for initialization errors.

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