Ctrl+C cannot interrupt stuck SSH/long-running Bash commands

Bug Description

When a Bash command (especially SSH remote commands) gets stuck or takes too long, Ctrl+C does not interrupt the command. The CLI becomes completely unresponsive and cannot accept any new input.

Steps to Reproduce

1. Run a long-running SSH command via Bash tool, e.g.:

``bash
ssh user@remote-server "docker compose exec -T app yt-dlp --dump-json 'https://youtube.com/...'"
``

1. While the command is running (showing "Running…" status)
2. Try pressing Ctrl+C to interrupt
3. Nothing happens - CLI remains stuck

Expected Behavior

• Ctrl+C should interrupt the running command
• User should be able to cancel and continue using the CLI

Actual Behavior

• Ctrl+C has no effect
• Escape has no effect
• CLI is completely frozen
• Only way to recover is to:
• Close the terminal window entirely
• Or pkill -f "ssh ..." from another terminal

Environment

• OS: macOS (Darwin 23.5.0)
• Claude Code version: latest
• Shell: zsh/bash

Additional Context

This is particularly problematic with:

• SSH commands to remote servers
• Commands with --timeout that don't respect the timeout
• Docker exec commands over SSH

The workaround Ctrl+\ (SIGQUIT) also doesn't work reliably.