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Add help parameter to arguments

Add help parameter to arguments: a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: click.argument() does not support a help parameter, unlike click.option()

The task

**Title:** `click.argument()` does not support a `help` parameter, unlike `click.option()`

Part of FineEnvs/repo2rlenv-commit-runtime.