🧪 Add standardized module testing to all modules

Ensures consistent testing framework across all TinyTorch modules with:

✅ Added standardized testing sections to modules that were missing them:
- 01_setup: Added complete testing section + module summary
- 02_tensor: Added testing section + comprehensive module summary
- 15_mlops: Standardized existing testing section to match convention

✅ All modules now follow the consistent pattern:
1. ## 🧪 Module Testing (markdown explanation)
2. Locked nbgrader cell with standardized-testing ID
3. run_module_tests_auto call to discover and run all tests
4. ## 🎯 Module Summary (educational wrap-up)

✅ Benefits:
- Consistent testing experience across all 16 modules
- Automatic test discovery and execution before module completion
- Standardized educational flow: learn → implement → test → reflect
- Professional testing practices with locked testing framework

✅ Verification: All 16 modules now have both:
- '## 🧪 Module Testing' section ✓
- 'run_module_tests_auto' call ✓

This ensures students always verify their implementations work correctly
before moving to the next module, following TinyTorch's educational philosophy.

modules/source/15_mlops/mlops_dev.py

@@ -1614,12 +1614,19 @@ test_comprehensive_integration()
 
 # %% [markdown]
 """
-## 🧪 Auto-Discovery Testing
+## 🧪 Module Testing
 
-The following cell automatically discovers and runs all test functions in this module:
+Time to test your implementation! This section uses TinyTorch's standardized testing framework to ensure your implementation works correctly.
+
+**This testing section is locked** - it provides consistent feedback across all modules and cannot be modified.
 """
 
-# %% nbgrader={"grade": false, "grade_id": "auto-discovery-tests", "locked": false, "schema_version": 3, "solution": false, "task": false}
+# %% nbgrader={"grade": false, "grade_id": "standardized-testing", "locked": true, "schema_version": 3, "solution": false, "task": false}
+# =============================================================================
+# STANDARDIZED MODULE TESTING - DO NOT MODIFY
+# This cell is locked to ensure consistent testing across all TinyTorch modules
+# =============================================================================
+
 if __name__ == "__main__":
     from tito.tools.testing import run_module_tests_auto