[BUG] `@` operator for referencing project files not working

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [x] Other: Claude Code (max plan login)
• Claude CLI version: v1.0.70
• Operating System: macOS latest
• Terminal: iTerm2

Bug Description

The @ operator for referencing files isn't working reliably / at all

Steps to Reproduce

1. Try to reference files that exist in the project with @, it does not find them or autocomplete.

Expected Behavior

1. I expect the @ to work
2. I expect the @ to work like fzf https://github.com/junegunn/fzf

Actual Behavior

Totally broken and not working at all, can't even reference files in the root directory of the project.

Additional Context

None