[Bug] CLI freezes immediately on simple input (v2.1.27, Linux/Ghostty)

Description

Claude Code CLI becomes completely unresponsive immediately after submitting a simple prompt (e.g., "Hi"). The application freezes without any error message or visual feedback, requiring forced termination.

Environment

| Component | Value |
|-----------|-------|
| Claude Code Version | 2.1.27 |
| OS | CachyOS (Arch-based) |
| Kernel | Linux 6.18.8-2-cachyos x86_64 |
| Node.js | v22.22.0 |
| Shell | zsh |
| Terminal | Ghostty (xterm-ghostty) |
| Claude Path | /usr/bin/claude |

Steps to Reproduce

1. Open Ghostty terminal
2. Run claude to start Claude Code CLI
3. Type Hi and press Enter
4. Result: CLI freezes immediately - no response, no spinner, no output

Expected Behavior

Claude should display a thinking indicator and respond to the input within a few seconds.

Actual Behavior

• CLI becomes completely unresponsive
• No output or error message displayed
• No spinner or loading indicator
• Process must be force-killed (Ctrl+C or kill -9)

Reproducibility

• Frequency: 100% - occurs on every attempt
• First noticed: Version 2.1.27

Troubleshooting Attempted

• [x] Restarted terminal
• [x] Tried different prompts (all freeze)

Diagnostic Information

$ claude --version
2.1.27 (Claude Code)

$ node --version
v22.22.0

$ which claude
/usr/bin/claude

$ uname -a
Linux thinh 6.18.8-2-cachyos #1 SMP PREEMPT_DYNAMIC x86_64 GNU/Linux

Additional Context

• Terminal: Ghostty (relatively new GPU-accelerated terminal emulator - may be relevant for compatibility testing)
• Using CachyOS with performance-optimized kernel (BORE scheduler)