fix: opencode打印已安装，又打印安装失败

[benym]

🔎 Existing issue check

• I have searched the existing issues.

🎯 Affected area

CLI command

📦 Comet version

0.3.9

💥 Current behavior

如图所示

✅ Expected behavior

如果失败打印原因才对

🔁 Steps to reproduce

1

🖥️ Environment

- OS:
- Shell:
- Node:
- Package manager:
- Install scope: project / global
- Skill language: en / zh
- Target AI platform(s):

📋 Logs or output

🧩 Additional context

No response