feat: Streamline agents to pure executor roles with enhanced workflow architecture

## Agent Streamlining
- **code-developer.md**: Reduce from 315 to 122 lines - pure code execution focus
- **action-planning-agent.md**: Reduce from 502 to 124 lines - pure planning execution
- Remove complex decision logic - commands layer now handles control flow
- Add clean code rules: minimize debug output, GBK compatibility, ASCII-only

## Workflow Architecture Enhancements
- Enhanced workflow-architecture.md with progressive complexity system
- Clear separation: Commands (control) → Agents (execution) → Output
- Improved task decomposition and TODO_LIST.md examples
- Added Gemini CLI standards references

## Command System Updates
- Updated task and workflow commands with enhanced functionality
- Better integration with streamlined agents
- Improved error handling and user experience

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/agents/conceptual-planning-agent.md

@@ -20,7 +20,7 @@ description: |
     user: "Analyze the authentication flow from a user perspective"
     assistant: "I'll use the conceptual-planning-agent to analyze authentication flow requirements. Given the user-focused nature, it will likely select ui-designer or user-researcher role to analyze user experience, interface design, and usability aspects."
 
-model: opus
+model: sonnet
 color: purple
 ---