Strange behaviour with devcontainer features generate-docs

I can't get `devcontainer features generate-docs` to work, I've tried every combo of switches and arguments I can think of, and they don't help.

It seems to treat everything as a directory, even other files!
I'm running version 0.68.0


Reproduce `devcontainer features generate-docs` on version 0.68.0, capturing the exact switches, arguments, and paths that cause files to be treated as directories. Trace the command's argument handling and define done as correctly distinguishing file and directory inputs, with a regression check if the repository's tests cover this command.

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