docs: document contributor style conventions for agents (#22879)

* feat(oxc-config): restore class member ordering through JS plugins

* docs: document class method ordering for agents and contributors

* docs: keep ordering rules in the contributor style guide

* docs: simplify the agent style guide reference

* docs: add JSDoc and module ordering conventions

AGENTS.md

@@ -0,0 +1,4 @@
+# Repository guidance
+
+Before changing code, read and follow the
+[contributor style guide](packages/appium/docs/en/contributing/index.md#code-style).

packages/appium/docs/en/contributing/index.md

@@ -103,6 +103,27 @@ export APPIUM_WORKSPACE=@appium/base-driver
 npm run test:unit -w $APPIUM_WORKSPACE
 ```
 
+### Code Style
+
+#### JSDoc
+
+Add concise JSDoc to all public class methods and exported functions.
+
+#### Module Ordering
+
+Place exported functions and classes before non-exported functions and classes in each module.
+This rule does not apply to constants or variables.
+
+#### Class Member Ordering
+
+When adding or moving class methods, follow these conventions:
+
+- Order methods by visibility: public → protected → private. Methods without an explicit visibility
+  modifier belong to the public group.
+- Place private helper methods at the end of the class.
+- Preserve existing order within each visibility group.
+- Before finishing, check the ordering of methods you added or moved.
+
 ### Documentation
 
 The documentation for this project is [available in the project repository itself](https://github.com/appium/appium/tree/master/packages/appium/docs).