add git commit guidelines to docs

CLAUDE.md

@@ -6,6 +6,12 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 **OmixLab LTD** - Package namespace: `com.omixlab`
 
+## Git Commit Guidelines
+
+**IMPORTANT**: When creating git commits:
+- **DO NOT** add yourself as a co-author (no `Co-Authored-By` lines)
+- **Commit messages must be a single line** - keep it concise and descriptive
+
 ## Project Overview
 
 Mosis is a **virtual smartphone OS** for VR games and applications. It provides a phone-like device that users can interact with inside VR environments, with real smartphone functionality.