[Bug] CLI crashes/freezes on startup in v2.1.27

Bug Description

Claude Code v2.1.27 freezes on startup - CLI becomes unresponsive and doesn't load properly. Shows "SessionStart:startup hook error" and "1 MCP server failed" but then hangs indefinitely.

Steps to Reproduce

1. Install/update to Claude Code v2.1.27
2. Run claude in terminal
3. CLI starts but freezes - no responses to input

Expected Behavior

CLI should start and be responsive

Actual Behavior

• Shows startup screen but becomes unresponsive
• "Booping..." appears but nothing else happens
• Have to pkill -9 claude to exit

Workaround

Downgrade to v2.1.22:

npm install -g @anthropic-ai/claude-code@2.1.22

This version works fine.

Environment

• OS: macOS (Darwin 25.1.0)
• Claude Code version: 2.1.27
• Working version: 2.1.22
• Multiple plugins installed (context7, superpowers, pr-review-toolkit, etc.)

Additional Context

Issue may be related to plugin loading or MCP server initialization in v2.1.27.