Revert "AI fix for"

This reverts commit 09584f8.

Author: dandavison

temporalio/converter.py

@@ -435,21 +435,6 @@ def __init__(self) -> None:
         """Create a default payload converter."""
         super().__init__(*DefaultPayloadConverter.default_encoding_payload_converters)
 
-    def with_context(self, context: SerializationContext) -> Self:
-        """Return a new instance with the given context, preserving the class type."""
-        # Create a new instance of the same class (works for subclasses too)
-        instance = self.__class__()
-        # Update the converters with context
-        instance.converters = {
-            encoding: (
-                converter.with_context(context)
-                if isinstance(converter, WithSerializationContext)
-                else converter
-            )
-            for encoding, converter in self.converters.items()
-        }
-        return instance
-
 
 class BinaryNullPayloadConverter(EncodingPayloadConverter):
     """Converter for 'binary/null' payloads supporting None values."""

temporalio/worker/_workflow_instance.py

@@ -225,8 +225,12 @@ def __init__(self, det: WorkflowInstanceDetails) -> None:
         self._workflow_input: Optional[ExecuteWorkflowInput] = None
         self._info = det.info
         self._context_free_payload_codec = det.data_converter.payload_codec
-        self._context_free_payload_converter = det.data_converter.payload_converter
-        self._context_free_failure_converter = det.data_converter.failure_converter
+        self._context_free_payload_converter = (
+            det.data_converter.payload_converter_class()
+        )
+        self._context_free_failure_converter = (
+            det.data_converter.failure_converter_class()
+        )
         self._payload_converter, self._failure_converter = (
             self._converters_with_context(
                 temporalio.converter.WorkflowSerializationContext(