Add section organization to 07_attention 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/07_attention/attention_dev.py

@@ -243,6 +243,8 @@ def scaled_dot_product_attention(Q: Tensor, K: Tensor, V: Tensor,
 
 # %% [markdown]
 """
+## 🔧 DEVELOPMENT
+
 ### 🧪 Test Your Attention Implementation
 
 Once you implement the `scaled_dot_product_attention` function above, run this cell to test it: