Add documentation for AI agents and introduce agent-assisted PR support.

[Chi-Shan0707]

feat: add AGENT_GUIDE for working with agents;
fix: two typos, one in README.md and one in CONTRIBUTING.md
docs: acknowledgement add myself()

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[Copilot]

Pull request overview

This PR improves contributor documentation by adding an AI-agent workflow guide and updating existing docs (including acknowledgements) to better support agent-assisted and manual contributions.

Changes:

• Add Agent/AGENT_GUIDE.md and Agent/README.md documenting an AI-agent assisted contribution flow.
• Update README.md to fix a formatting issue and add an “AI Agent 辅助贡献” section linking to the new guide.
• Fix a typo in .github/CONTRIBUTING.md and add an acknowledgement entry in pages/index.mdx.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
README.md	Fixes command formatting and introduces an AI-agent contribution entrypoint linking to the agent guide.
pages/index.mdx	Adds a new contributor acknowledgement entry.
Agent/README.md	Documents what the Agent/ directory contains and how to use it with an AI agent.
Agent/AGENT_GUIDE.md	Adds a detailed end-to-end agent operating guide for adding course resources and updating navigation/pages.
.github/CONTRIBUTING.md	Corrects the course registry file reference from _meta.json to _meta.ts.

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[Copilot]

[使用与贡献指南](/pages/guide.mdx) 这种以 / 开头的链接在 GitHub README 中会被解析为站点根路径，通常会跳到 github.com/pages/guide.mdx 而不是仓库文件；建议改成相对仓库路径（如 ./pages/guide.mdx / pages/guide.mdx），或如果想指向站点路由则用 /guide。

[Copilot]

鸣谢列表末尾的 - 是一个空的列表项，渲染时会出现空 bullet，且可能影响后面 --- 分隔线的解析；建议删除该空行并在列表与 --- 之间保留一个空行即可。

Suggested change

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[Copilot]

该指南里使用了特定 Agent 平台的“Read / Edit / Write / Bash / AskUserQuestion”等工具名与强约束（例如“必须使用 Bash 工具执行 mv”）。如果目标读者包含 Claude Code、Copilot Workspace 等不同平台，建议在文档中明确这些是“概念步骤/示例”，并给出更通用的表述（如“在终端执行 mv”“如需确认则直接向用户提问”），避免读者误以为必须具备同名工具。

[Chi-Shan0707]

I forget add instructions for agent-assited PR in CONTRIBUTING.md