Unable to read from fs in slash command extension

[JaLnYn]

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• [X] Completed

Describe the bug / provide steps to reproduce it

I am attempting to write an extension that allows users to find and select python environments with a simple command. However, while the code logic works outside of zed extensions, I am getting os error 44 inside running inside the extension.

Code to reproduce is here https://github.com/JaLnYn/zed_pyenvselect Steps:

1. install extension
2. run /pyenvlst to lst commands

   
   Expected output:
   ======
   some python envs ...
   ======
   len n

Actual output:

Error reading directory ([worktree directory]): No such file or directory (os error 44) ======

I have appended error to the text output to see it. 

### Environment

Zed: v0.149.5 (Zed)
OS: macOS 14.6.1
Memory: 16 GiB
Architecture: aarch64

### If applicable, add mockups / screenshots to help explain present your vision of the feature

_No response_

### If applicable, attach your Zed.log file to this issue.

<details><summary>Zed.log</summary><pre>
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[maxdeviant]

Extensions run inside of the Wasm sandbox and can currently only perform arbitrary file I/O within the extension working directory.

[JaLnYn]

Extensions run inside of the Wasm sandbox and can currently only perform arbitrary file I/O within the extension working directory.

Is there documentation you can point to about how to perform io operations within the working directory?

[JaLnYn]

There is no way to search the file directories either.