Standardize section headers for 02_tensor module

modules/source/02_tensor/tensor_dev.py

@@ -820,6 +820,11 @@ Congratulations! You've successfully implemented the core Tensor class for TinyT
 **Ready for the next challenge?** Let's add the mathematical functions that make neural networks powerful!
 """
 
+# %% [markdown]
+"""
+## 🔧 DEVELOPMENT
+"""
+
 # %% [markdown]
 """
 ### 🧪 Unit Test: Tensor Creation