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I want an existing DropboxClient instance to expose cursor-based remote change polling and listing methods…

I want an existing DropboxClient instance to expose cursor-based remote change polling and listing methods…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). wait for remote changes should long-poll Dropbox for changes after the supplied cursor and return True when…

The task

`wait_for_remote_changes` should long-poll Dropbox for changes after the supplied cursor and return `True` when changes are available and `False` when the poll times out without changes. It should reject invalid timeouts outside the Dropbox long-poll range `[30, 480]` by raising `ValueError`. When Dropbox asks the…

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