feat(agent): Add ms-copilot-unofficial

[buzz-lightsnack-2007]

📝 信息 | Information

This is to replace my previous pull request where the chatbot failed to detect the content of the MarkDown document. The system prompt based on https://github.com/0xeb/TheBigPromptLibrary/blob/main/SystemPrompts/Copilot/microsoft_copilot_website_09192025.md

✅ 检查列表 | Checklist:

• 我已阅读了 Readme.md
• 描述是用英文编写的。
• meta.json 和 agent_template.json 没有被修改过。
• entry 放置在 agents 目录中，并且使用 .json 文件扩展名。

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• I have read the Readme.md
• The description is written in English.
• The meta.json and agent_template.json have not been modified.
• The entry is placed in the agents directory with the .json file extension.

Summary by Sourcery

New Features:

• Introduce the ms-copilot-unofficial agent definition as a new entry in the agents catalog.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a new unofficial Microsoft Copilot-style agent configuration as a standalone JSON entry without modifying shared templates or metadata.

File-Level Changes

Change	Details	Files
Introduce a new agent definition for an unofficial Microsoft Copilot variant.	Create a new JSON agent configuration file under src defining an ms-copilot-unofficial agent Embed a system prompt derived from the Microsoft Copilot website system prompt reference Configure core agent properties such as name, description, and behavior to match the Copilot-like experience	src/ms-copilot-unofficial.json

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👍 @buzz-lightsnack-2007

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