VSCode CodeTour 专家代理

"VSCode Tour Expert agent from the awesome-copilot repository by Copilot and aaronpowell" ## Credit: * Source Repository: [awesome-copilot](https://github.com/github/awesome-copilot/) * Original File: [agents/code-tour.agent.md](https://github.com/github/awesome-copilot/blob/main/agents/code-tour.agent.md) * Authors: Copilot and aaronpowell * License: Check the repository's LICENSE file (appears to be in the root directory)