Improve code quality, accessibility, error handling, and add comprehensive Coding Agent documentation#1

Copilot wants to merge 3 commits intomainhuangyingting/github-copilot-workshop:mainfrom

copilot/fix-6edf2a98-bc12-4bf2-a05d-6a572bb80d39huangyingting/github-copilot-workshop:copilot/fix-6edf2a98-bc12-4bf2-a05d-6a572bb80d39Copy head branch name to clipboard