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<new-for-builtins : potential side effects auto fix

<new-for-builtins : potential side effects auto fix: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). to this: js const str = String('test')

The task

to this: ```js const str = String('test') ```

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