chore(api): convert AppContext from ABC to Protocol (#37203)

api/context/execution_context.py

@@ -7,7 +7,6 @@ consumes injected context managers when it needs to preserve thread-local state.
 
 import contextvars
 import threading
-from abc import ABC, abstractmethod
 from collections.abc import Callable, Generator
 from contextlib import AbstractContextManager, contextmanager
 from typing import Any, Protocol, final, override, runtime_checkable
@@ -15,28 +14,25 @@ from typing import Any, Protocol, final, override, runtime_checkable
 from pydantic import BaseModel
 
 
-class AppContext(ABC):
+class AppContext(Protocol):
     """
-    Abstract application context interface.
+    Application context interface.
 
     Application adapters can implement this to restore framework-specific state
     such as Flask app context around worker execution.
     """
 
-    @abstractmethod
     def get_config(self, key: str, default: Any = None) -> Any:
         """Get configuration value by key."""
-        raise NotImplementedError
+        ...
 
-    @abstractmethod
     def get_extension(self, name: str) -> Any:
         """Get application extension by name."""
-        raise NotImplementedError
+        ...
 
-    @abstractmethod
     def enter(self) -> AbstractContextManager[None]:
         """Enter the application context."""
-        raise NotImplementedError
+        ...
 
 
 @runtime_checkable

api/tests/unit_tests/core/workflow/context/test_execution_context.py

@@ -20,15 +20,6 @@ from context.execution_context import (
 )
 
 
-class TestAppContext:
-    """Test AppContext abstract base class."""
-
-    def test_app_context_is_abstract(self):
-        """Test that AppContext cannot be instantiated directly."""
-        with pytest.raises(TypeError):
-            AppContext()  # type: ignore
-
-
 class TestNullAppContext:
     """Test NullAppContext implementation."""