1. Rename factory.py's EvoAgent data class to AgentConfig
- Avoids naming conflict with base/evo_agent.py's EvoAgent
2. Export pipeline_runner functions in backend/core/__init__.py
- Add create_agents, create_long_term_memory, stop_gateway
3. Consolidate PromptLoader to singleton pattern
- Add get_prompt_loader() singleton function
- Update all usages to use singleton
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>