[Bug] Tab completion truncates file paths at directory boundaries

Bug Description
Tab complete is not working:

❯ review the @gap_analysis.md

• apps/agents/src/agents/prd_generation/prompts/agents/gap_analysis.md

Completion shows the gap_analysis.md, it is highlighted blue, but when I hit tab, it completes to this:

❯ review the @apps/agents/src/agents/prd_

• apps/agents/src/agents/prd_review/

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.19
• Feedback ID: 72032138-c03b-4fc5-9514-fb4e29b0e5ba

Note: Content was truncated.