Integrate comprehensive testing framework with Makefile

- Added unit tests for YAML loading and parsing functionality
- Created integration tests for multiple activity files validation
- Implemented functional tests for complete activity workflows
- Added battleship pre_script functionality tests
- Integrated all test types into comprehensive Makefile
- Fixed CLI validator test with proper failing fixture
- Applied black formatting to all Python files
- Removed problematic hardcoded targets from Makefile
- Added proper venv dependency management

Test coverage includes:
- Unit: YAML loading, validator functionality
- Integration: Cross-file validation, metadata operations
- Functional: End-to-end activity flows, pre_script execution
- All 30 activity files validated and tested

models.py

@@ -6,6 +6,7 @@ import json
 
 db = SQLAlchemy()
 
+
 class Room(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     name = db.Column(db.String(128), nullable=False, unique=True)