[Bug] /config opened twice in same session causes full session freeze (Windows 11)

Bug Report

OS: Windows 11 Pro
Shell: bash (Claude Code terminal)
Claude Code version: latest channel

Steps to Reproduce

1. Open a Claude Code session
2. Run /config
3. Close/exit the config UI
4. Run /config again in the same session

Expected Behavior

Config UI opens normally on second invocation.

Actual Behavior

The entire Claude Code session freezes. No further input is processed. Terminal restart required to recover.

Additional Context

Reproducible consistently. First /config invocation works fine — freeze only occurs on the second call within the same session.