[BUG] ralph-loop plugin

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 Description

Running /ralph-loop without arguments causes a bash error:

PROMPT_PARTS[*]: unbound variable

## Root Cause
In scripts/setup-ralph-loop.sh line 113, the script uses set -u but references an empty array:
```bash
PROMPT="${PROMPT_PARTS[*]}"

What Should Happen?

Fix

Change line 113 to:
PROMPT="${PROMPT_PARTS[*]:-}"

This provides a default empty string when the array is empty.

Error Messages/Logs

/ralph-loop/96276205880a/scripts/setup-ralph-loop.sh" $ARGUMENTS
/ralph-loop/96276205880a/scripts/setup-ralph-loop.sh: line 113:PROMPT_PARTS[*]: unbound variable

Steps to Reproduce

1. 安装 Claude Code CLI (版本 2.1.9)
2. 启用 ralph-loop 插件
3. 运行命令：

/ralph-loop

1. （不带任何参数）

预期行为 (Expected Behavior)

显示错误提示："No prompt provided"，并给出使用示例。

实际行为 (Actual Behavior)

Bash 脚本报错：
/Users/xxx/.claude/plugins/cache/claude-plugins-official/ralph-loop/96276205880a/scripts/setup-ralph-loop.sh: line 113: PROMPT_PARTS[*]: unbound variable

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.9 (Claude Code)

Platform

AWS Bedrock

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_