fix: Apply black formatting to resolve CI formatting issues

api_testgen/core/exceptions.py

@@ -3,34 +3,41 @@
 
 class SpecParserError(Exception):
     """Base exception for spec parser errors."""
+
     pass
 
 
 class InvalidOpenAPISpecError(SpecParserError):
     """Raised when OpenAPI specification is invalid."""
+
     pass
 
 
 class UnsupportedVersionError(SpecParserError):
     """Raised when OpenAPI version is not supported."""
+
     pass
 
 
 class AuthConfigError(Exception):
     """Base exception for auth configuration errors."""
+
     pass
 
 
 class MissingSecuritySchemeError(AuthConfigError):
     """Raised when security scheme is not defined in spec."""
+
     pass
 
 
 class GeneratorError(Exception):
     """Base exception for generator errors."""
+
     pass
 
 
 class TemplateRenderError(GeneratorError):
     """Raised when template rendering fails."""
+
     pass