docs(agents): add agent workflow instructions (#2629)

- 添加 PR 创建前读取模板的 agent 规则
- 添加提交消息格式和签名相关规则
- 明确不得编造测试、验证或提交内容

Signed-off-by: jyxjjj <16695261+jyxjjj@users.noreply.github.com>
Co-authored-by: Codex <267193182+codex@users.noreply.github.com>

Author: jyxjjj

AGENTS.md

@@ -0,0 +1,50 @@
+# Agent Instructions
+
+## Issues
+
+Before creating an issue, review the available issue templates in the `.github` directory.
+
+When drafting the issue:
+
+- Use the most appropriate template.
+- Follow the template structure.
+- Fill in all required sections.
+- Remove sections that the template explicitly marks as optional or not applicable.
+- Do not invent reproduction steps, logs, screenshots, or expected behavior.
+
+## Pull Requests
+
+Before creating a pull request, read `.github/PULL_REQUEST_TEMPLATE.md`.
+
+When drafting the pull request:
+
+- Follow the template structure.
+- Use the title format required by the template.
+- Fill in or remove each section according to the template guidance.
+- Include testing details, or explain why testing was not run.
+- Do not invent testing results.
+- Do not claim validation, verification, or review steps that were not actually performed.
+
+## Git Commits
+
+When creating commits, follow the repository `git-commit` skill rules:
+
+- Use Conventional Commits title format: `type(scope): subject`.
+- Allowed types: `feat`, `fix`, `refactor`, `perf`, `docs`, `style`, `test`, `build`, `ci`, `chore`, `revert`.
+- Use a meaningful scope based on the main module, package, or feature.
+- Write the subject in imperative mood and describe the actual change.
+- Use a concise Markdown list in the commit body, with each item describing one key change.
+- Do not invent changes that are not present in the diff.
+- Do not describe behavior, refactors, fixes, or tests that are not reflected in the commit.
+
+Include at most one `Co-authored-by` trailer that matches the AI assistant actually used to produce the change.
+
+Examples:
+
+- `Co-authored-by: Codex <267193182+codex@users.noreply.github.com>`
+- `Co-authored-by: GitHub Copilot <copilot@github.com>`
+- `Co-authored-by: Claude <81847+claude@users.noreply.github.com>`
+
+If you are not one of the listed assistants, do not add a `Co-authored-by` trailer.
+
+Instead, ask the human collaborator to provide the exact `Co-authored-by` trailer to use. Do not invent, infer, or generate one yourself.