[BUG] bug: Claude Code plugins crash on Windows when user path contains accented characters

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?

bug: Claude Code plugins crash on Windows when user path contains accented characters

Environment:

OS: Windows 11 Pro
Claude Code: VS Code extension
User path: C:\Users\Kévin MARTIN\.claude\plugins\
Problem:
Installing any plugin from the anthropics/claude-code marketplace causes Claude Code to crash completely when the Windows username contains accented characters (é, à, ü, etc.). The Python hooks inside plugins cannot handle non-ASCII characters in Windows paths.

Steps to reproduce:

Windows user account with accented character in username (e.g. "Kévin")
Install any plugin via Manage Plugins → claude-code-plugins marketplace
Claude Code crashes / becomes unresponsive
Expected: Plugins work regardless of username characters
Actual: Full crash, had to uninstall all plugins to recover

What Should Happen?

Plugins install and load correctly regardless of accented characters in the Windows username path.

Error Messages/Logs

Claude CLI exited with code 1: × Failed to install plugin "code-review@claude-code-plugins": 
Source path does not exist: C:\Users\Kévin MARTIN\.claude\plugins\marketplaces\claude-code-plugins\plugins\code-review

Root cause: Python hooks inside plugins cannot handle non-ASCII characters (é, à, ü, etc.) 
in Windows paths (C:\Users\Kévin MARTIN\.claude\plugins\)

Steps to Reproduce

1. Have a Windows user account with an accented character in the username (e.g. "Kévin")
2. Open Claude Code in VS Code
3. Open Manage Plugins → add marketplace: https://raw.githubusercontent.com/anthropics/claude-code/main/.claude-plugin/marketplace.json
4. Install any plugin (e.g. hookify, code-review)
5. Claude Code crashes / freezes completely

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude Code for VS Code v2.1.96

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_