📝 docs: add comprehensive commit conventions with gitmoji reference

Added detailed commit conventions section including:
- Conventional Commit types (feat, fix, docs, style, refactor, perf, test, chore)
- Practical examples for each commit type
- Comprehensive gitmoji reference table with 16 common emojis
- Emoji codes, types, and descriptions for quick reference
- Benefits of using the convention

This provides a complete indexed reference so we won't need to check
gitmoji.dev repeatedly for common emojis.

AGENTS.md

@@ -715,6 +715,72 @@ type ApiV1Greet interface {
 }
 ```
 
+## 📝 Commit Conventions
+
+**Follow Conventional Commits for clear communication:**
+
+**Core Types:**
+- `feat`: New user-facing feature
+- `fix`: Bug fix for users
+- `docs`: Documentation changes
+- `style`: Code formatting (no functional change)
+- `refactor`: Code structure changes
+- `perf`: Performance improvements
+- `test`: Test additions/corrections
+- `chore`: Build process, dependencies, maintenance
+
+**Examples:**
+```bash
+# New feature
+git commit -m "feat: add user authentication"
+
+# Bug fix
+git commit -m "fix: prevent race condition in cache"
+
+# Documentation
+git commit -m "docs: add API endpoint documentation"
+
+# Maintenance
+git commit -m "chore: update dependencies"
+
+# Refactoring
+git commit -m "refactor: extract user service from controller"
+```
+
+**Optional Emoji Support:**
+- Use [gitmoji](https://gitmoji.dev) for visual commit messages
+- Example: `git commit -m "✨ feat: add new API endpoint"`
+
+**Common Gitmoji Reference:**
+
+| Emoji | Code | Type | Description |
+|-------|------|------|-------------|
+| ✨ | `:sparkles:` | feat | New feature |
+| 🐛 | `:bug:` | fix | Bug fix |
+| 📝 | `:memo:` | docs | Documentation |
+| 🎨 | `:art:` | style | Code formatting |
+| 🔧 | `:wrench:` | chore | Build/config changes |
+| ♻️ | `:recycle:` | refactor | Code refactoring |
+| 🚀 | `:rocket:` | perf | Performance improvements |
+| 🔒 | `:lock:` | security | Security fixes |
+| 📦 | `:package:` | dependencies | Dependency changes |
+| 🔥 | `:fire:` | remove | Remove code/files |
+| 🐧 | `:penguin:` | linux | Linux-specific changes |
+| 🍎 | `:apple:` | macos | macOS-specific changes |
+| 🪟 | `:window:` | windows | Windows-specific changes |
+| 🤖 | `:robot:` | ci | CI/CD changes |
+| 🧪 | `:test_tube:` | test | Tests |
+| 📈 | `:chart_with_upwards_trend:` | analytics | Analytics/SEO |
+| 🌐 | `:globe_with_meridians:` | i18n | Internationalization |
+| ⚡ | `:zap:` | performance | Performance improvements |
+
+**Benefits:**
+- Clear communication of change types
+- Better git history readability
+- Tool compatibility (changelog generators, etc.)
+- Consistent project history
+- Visual scanning of commit history
+
 ## 📞 Support
 
 For issues or questions: