Remove development artifacts from reference-agent

Remove 14 development/testing files:
- SETUP_PLAN.md, TESTING_GUIDE.md, SETUP_MEMORY_SERVER.md (redundant docs)
- course_catalog_clean.json, course_catalog_unique.json (unused data)
- debug_agent.py, final_test.py, verify_courses.py (deprecated scripts)
- example_user_knowledge_summary.py, generate_unique_courses.py (unused utilities)
- test_agent.py, test_full_setup.py, test_user_knowledge_tool.py (redundant with tests/)
- simple_check.py (not referenced)

Update QUICK_START.md to remove references to deleted files.

Keep only essential files for package installation and usage.

Author: nkanu17

python-recipes/context-engineering/reference-agent/QUICK_START.md

@@ -163,17 +163,16 @@ python examples/basic_usage.py
 ## 📖 Next Steps
 
 1. **Read the full README**: `README.md`
-2. **Check examples**: `examples/` directory  
-3. **Follow setup plan**: `SETUP_PLAN.md`
-4. **Troubleshoot issues**: `INVESTIGATION_GUIDE.md`
-5. **Customize the agent**: Modify `redis_context_course/agent.py`
+2. **Check examples**: `examples/` directory
+3. **Customize the agent**: Modify `redis_context_course/agent.py`
+4. **Explore the notebooks**: See `../notebooks/` for educational content
 
 ## 🆘 Need Help?
 
 1. **Run health check**: `python simple_health_check.py`
-2. **Check investigation guide**: `INVESTIGATION_GUIDE.md`
-3. **Review logs**: Look for error messages in terminal
-4. **Reset everything**: Follow rollback plan in `SETUP_PLAN.md`
+2. **Review logs**: Look for error messages in terminal
+3. **Check Redis**: Ensure Redis is running on port 6379
+4. **Check Agent Memory Server**: Ensure it's running on port 8088
 
 ## 🎉 Success!