[BUG] mishandles absolute paths (prepends CWD to absolute destination)

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 using claude (Claude Code CLI) to export a conversation to an absolute path, the command incorrectly prefixes the current working directory (CWD) to the absolute path. This results in a combined, invalid path and an ENOENT error.

Full session excerpt:

om777:~/Documents/sippy$ claude
╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code!                         │
│                                                   │
│   /help for help, /status for your current setup  │
│                                                   │
│   cwd: /home/om777/Documents/project                │
╰───────────────────────────────────────────────────╯

> Hello

● Hello! I'm Claude Code, ready to help you with your software engineering tasks. What would you like to work on today?

> /export /home/om777/Documents/qwerty.txt
  ⎿  Failed to export conversation: ENOENT: no such file or directory, open '/home/om777/Documents/project/home/om777/Documents/qwerty.txt'

What Should Happen?

If the destination begins with / (absolute path), it should be used as-is and not joined with the CWD. The file /home/om777/Documents/qwerty.txt should be created (with parent directories respected/created if needed).

Error Messages/Logs

Failed to export conversation: ENOENT: no such file or directory, open '/home/om777/Documents/project/home/om777/Documents/qwerty.txt'

Steps to Reproduce

STR:

1. Open the Claude Code TUI in a directory, e.g. /home/om777/Documents/project
2. Start a conversation and then run:

/export /home/om777/Documents/qwerty.txt

Actual result:
Claude attempts to write to a path that incorrectly combines the CWD with the absolute path:

Failed to export conversation: ENOENT: no such file or directory, open '/home/om777/Documents/project/home/om777/Documents/qwerty.txt'

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.123

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_