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Personally, I'd say that a script is:

- A program

- Contained in a single file

- Distributed in source code form

- Intended to automate a single well-defined process

- With no or minimal interactivity beyond command-line parameters.

In essence, a script is just a formalization of a task a user is trying to accomplish. It could be replaced by a well-trained monkey and primarily serves to avoid making mistakes when trying to execute it again and again.

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I've written "scripts" that do things like create a user, run migrations, or do some processing on a file that pull in either or both of 3rd-party libraries or other code I wrote (ie. db models). So the "contained in a single file" for me isn't a hard requirement. I do think the rest of your points are accurate though. I'd also add that a script runs until the task is done, and no longer. Whereas you may have other programs, like web services or queue workers, that continue running and doing their tasks.

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