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Is there some name for the combination of text files and an IDE? A grouping like “GUI”

Can you say more? Typically, IDEs are used to edit text files (though they interact with other types of files as well). Are you referring to the directory structure of files that an IDE might open up?

(I know you know IDEs edit files, just trying to clarify the causal relationship)

The closest I can think of is "environment" or "workspace".