Apply formatting fixes to achieve 10/10 consistency

- Add 🧪 emoji to all test_module() docstrings (20 modules)
- Fix Module 16 (compression): Add if __name__ guards to 6 test functions
- Fix Module 08 (dataloader): Add if __name__ guard to test_training_integration

All modules now follow consistent formatting standards for release.

modules/15_quantization/quantization.py

@@ -1570,7 +1570,8 @@ Final validation that our quantization system works correctly across all compone
 
 # %% nbgrader={"grade": true, "grade_id": "test_module", "locked": true, "points": 20, "solution": false, "schema_version": 3}
 def test_module():
-    """
+    """🧪 Module Test: Complete Integration
+
     Comprehensive test of entire quantization module functionality.
 
     This final test runs before module summary to ensure: