[BUG] Temporary files (.tmp.*) not cleaned up in project directory

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?

Current Behavior

Claude Code creates temporary files but does not remove them after operations complete.
[filename].tmp.[timestamp]

What Should Happen?

1. Temporary .tmp.* files in the project directory should be removed immediately after the file operation completes
2. If cleanup fails, at minimum these patterns should be added to a suggested .gitignore: .tmp.

Error Messages/Logs

Steps to Reproduce

Steps To Reproduce

1. Run Claude Code in a project directory
2. Perform file editing operations
3. Complete or exit the session
4. Check the project directory for leftover files

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.38

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_