Prefix `./` to completion of `@{filename}` if the path is not obviously a path

What variant of Codex are you using?

CLI

What feature would you like to see?

This is similar to https://github.com/openai/codex/issues/6915, but the feature request is different: the author request for @ to be kept after the tab completion.

Instead, I propose the following: say there's a file hello in the current directory, you type @h and tab, it will complete to hello. Since the agent has no idea that it was tab-completed from a filename, it wouldn't know it's intended to be a filename.

It would be better (and still reasonably backwards compatible) to: if the file does not have an extension and is in the current directory, prefix ./. So in the example above the agent will see ./hello which is obviously a file path.

Additional information

_No response_