Confirmation prompts work when input is piped into Claude Code

The helper that asks a question in the terminal and waits for an answer referred to things that did not exist, so it could not work. It now uses the right input connection. When standard input (what Claude Code reads from) is not an interactive terminal, such as when text is piped in, it reads the answer line. If input closes without an answer, the prompt ends with no answer instead of hanging.