[BUG] @-file references resolve to parent git repo root instead of cwd when launched inside a jj workspace (.workspaces/<name>/)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When I launch claude inside a jujutsu (jj) workspace nested under a parent git clone (eg. <git-repo>/.workspaces/<my-workspace>), referencing files with @ resolves to the parent repo (<git-repo>/path/to/file) instead of cwd (<git-repo>/.workspaces/<my-workspace>/path/to/file).

The session's primary working dir is correct (the workspace dir), so I presume the bug is in the @ resolution/completion.

What Should Happen?

@ file references should use the nested workspace as reference.

Error Messages/Logs

<img width="1272" height="332" alt="Image" src="https://github.com/user-attachments/assets/e9efa443-70d0-49a4-9142-368d656979c6" />

Steps to Reproduce

1. Starting from a plain git repo
2. Init jj with jj git init
3. mkdir .workspaces
4. Create a nested workspace with jj add .workspaces/test-workspace
5. cd .workspaces/test-workspace
6. Run claude and try to reference a file with @. You should see completion options like @../../my-file instead of @my-file

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.141

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_