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Add a file-watching utility

Add a file-watching utility: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). We want marimo to be able to react when a notebook file changes on disk (for example, to reload an app when the underlying .py file is edited by another tool). As a first building block we…

The task

We want marimo to be able to react when a notebook file changes on disk (for example, to reload an app when the underlying `.py` file is edited by another tool). As a first building block we need a small, reusable file-watching utility in marimo's internal utils package.

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