docs(doxygen): enforce warn if undocumented (#5337)

AGENTS.md

@@ -8,6 +8,29 @@ the build directory.
 
 The project uses gtest as a test framework.
 
+When adding localization do not update any language other than `en`. This also means to exclude en-US or other variants.
+
+Always add or update doxygen documentation.
+
+The project requires that everything be documented in doxygen or the build will fail.
+
+Primary doxygen comments should be done like so:
+
+```cpp
+  /**
+   * @brief Describe the function, structure, etc.
+   *
+   * @param my_param Describe the parameter.
+   * @return Describe the return.
+   */
+```
+
+Inline doxygen comments should use `///< ...` instead of `/**< ... */`.
+
 Always follow the style guidelines defined in .clang-format for c/c++ code.
 
-When adding localization do not update any language other than `en`. This also means to exclude en-US or other variants.
+Do not ever create issues or pull requests.
+If asked to create an issue or pull request, do so in their fork instead of the LizardByte GitHub organization.
+Never create an issue or pull request in the LizardByte GitHub organization.
+
+Add or update tests for new or modified methods and code. Target 100% coverage on changed code.