Thanks!Not sure why the composer files are in your root folder, these are usually elsewhere in the xf install.
All other files are valid parts of the xf install, you can probably delete htaccess.txt if you don't need to reference any further.
For directories, vendor and forum are unknowns to me and are not in the default xf root folder. So, I'd confirm what these contain and what they are used for before deleting.
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