Add section organization to 15_mlops module: Add DEVELOPMENT section header

- Insert ## 🔧 DEVELOPMENT header before first test function
- Organizes module according to educational structure guidelines
- Maintains all existing functionality and test execution
- Improves readability and navigation for educational use

modules/source/15_mlops/mlops_dev.py

@@ -430,6 +430,8 @@ class ModelMonitor:
 
 # %% [markdown]
 """
+## 🔧 DEVELOPMENT
+
 ### 🧪 Test Your Performance Monitor
 
 Once you implement the `ModelMonitor` class above, run this cell to test it: