add about pr review

Co-authored-by: Copilot <copilot@github.com>

Author: kevinjqliu

AGENTS.md

@@ -167,6 +167,8 @@ Pull requests that are authored or substantially generated by AI agents **must**
 
 See the [ASF generative tooling guidelines](https://www.apache.org/legal/generative-tooling.html) for additional policy on AI-generated contributions. Note that AI-generated code cannot carry copyright, so the Apache License header does not apply to purely generated files.
 
+AI-generated review comments **must** be reviewed for accuracy before posting. Auto-posting unreviewed AI comments is discouraged.
+
 ### Required Fields
 
 - **Model**: Set this to your model identifier and version (e.g., `Claude Opus 4.6`, `GPT-4o`, `Gemini 2.5 Pro`).