[BUG] Superpowers plugin breaks terminal input on Windows - SessionStart hook error

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:
When the superpowers@claude-plugins-official plugin is enabled, Claude Code starts successfully but the terminal becomes completely unresponsive to keyboard input. The cursor is visible but typing has no effect.
Error in debug output:
⎿ SessionStart:startup hook error

Timeline:
Worked correctly a few hours before the issue started
Possibly related to a recent auto-update

Additional context:
Issue occurs in both MinGW64 terminal and PowerShell. Node.js REPL works fine, indicating it's specific to Claude Code's superpowers plugin startup hook.

What Should Happen?

claude code should respond.

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:
Enable superpowers plugin in ~/.claude/settings.json
Run claude command
Terminal loads but cannot accept any keyboard input

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.31 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Environment:
OS: Windows (MinGW64/PowerShell)
Claude Code version: v2.1.31
Node.js version: v22.16.0

Workaround:
Disabling the superpowers plugin in settings.json resolves the issue. All other plugins work correctly.