ResponseFunctionCallArgumentsDoneEvent.name is marked required but not sent by the API

[nezhyborets]

The ResponseFunctionCallArgumentsDoneEvent schema has name listed in its required array, but the API does not include it in the actual streaming event payload.

Spec:

ResponseFunctionCallArgumentsDoneEvent:
  properties:
    name:
      type: string
      description: The name of the function that was called.
  required:
    - type
    - item_id
    - name        # ← present here
    - output_index
    - arguments
    - sequence_number

Actual payload received from the API:

{
  "type": "response.function_call_arguments.done",
  "arguments": "{\"location\":\"Kyiv\",\"unit\":\"celsius\"}",
  "item_id": "fc_09038a97a2687827006a10d056419c819c809e74e8d15a7858",
  "output_index": 0,
  "sequence_number": 14
}

name is absent. This causes strict decoders (e.g. generated Swift clients via swift-openapi-generator) to fail with a keyNotFound error.

Expected: name should be removed from required since it is not present in API responses. The function name is already available from the preceding response.output_item.added event.

Observed error (Swift):

DecodingError.keyNotFound: Key 'name' not found in keyed decoding container.