[BUG] Sandbox - process substitution doesn't work with sandbox restrictions

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?

It's similar to #16306 but I thought it needed a more concise description.

Claude tends to use process substitution a lot.

But these are ultimately incompatible with the sandbox, since the file descriptors used are blocked.

What Should Happen?

Process substitution working

Error Messages/Logs

⏺ Bash(diff <(echo -e "a\nb\nc") <(echo -e "a\nx\nc"))                                                                                                                                                 
  ⎿  Error: Exit code 2                                                                                                                                                                                
     diff: /dev/fd/11: Operation not permitted

Steps to Reproduce

Ask Claude:
❯ can you run an example of Process substitution?

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.37 (Claude Code)

Platform

Other

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_