Add global configuration update documentation

- Document when and how to update global configuration
- Include specific scenarios for different types of changes
- Provide step-by-step update workflow
- Add verification and testing instructions
- Recommend best practices for development vs deployment

README.md

@@ -308,6 +308,91 @@ opencode  # Will load global agents
     └── security.txt    # Security analysis
 ```
 
+## Updating Global Configuration
+
+After making changes to the nano project agents, you need to sync them with the global configuration:
+
+### When to Update
+- Edited agent prompts
+- Added new agents
+- Removed existing agents
+- Modified agent configurations
+- Changed opencode.json settings
+
+### Update Steps
+
+#### 1. Copy Changes to Global Location
+```bash
+# Navigate to nano project directory
+cd /path/to/nano-opencode-agents
+
+# Copy updated agent files
+cp .opencode/agent/* ~/.config/opencode/agent/
+cp prompts/* ~/.config/opencode/prompts/
+
+# Update global config if needed
+cp opencode.json ~/.config/opencode/config.json
+```
+
+#### 2. Verify the Update
+```bash
+# Check that files are current
+ls -la ~/.config/opencode/agent/
+ls -la ~/.config/opencode/prompts/
+cat ~/.config/opencode/config.json
+```
+
+#### 3. Test Global Agents
+```bash
+# Test from any directory
+cd /tmp
+opencode  # Should load updated agents
+```
+
+### Specific Update Scenarios
+
+#### Prompt Edits
+```bash
+# Single prompt update
+cp prompts/cleanup.txt ~/.config/opencode/prompts/
+```
+
+#### New Agent Added
+```bash
+# Copy new agent and update config
+cp .opencode/agent/new-agent.md ~/.config/opencode/agent/
+cp prompts/new-agent.txt ~/.config/opencode/prompts/
+# Update ~/.config/opencode/config.json with new agent entry
+```
+
+#### Agent Removal
+```bash
+# Remove from global location
+rm ~/.config/opencode/agent/removed-agent.md
+rm ~/.config/opencode/prompts/removed-agent.txt
+# Remove from ~/.config/opencode/config.json
+```
+
+#### Configuration Changes
+```bash
+# Update global config completely
+cp opencode.json ~/.config/opencode/config.json
+```
+
+### Workflow Recommendation
+
+1. **Make changes** in nano project (version controlled)
+2. **Test locally** in nano project directory
+3. **Commit changes** to git repository
+4. **Sync to global** using the steps above
+5. **Verify globally** by testing from another directory
+
+This workflow ensures:
+- Version control of all changes
+- Clean separation between development and deployment
+- Easy rollback if needed
+- Shareable configuration for team members
+
 ### Method 3: Project-Specific Customization
 
 #### Step 1: Initialize Project