fix: add missing MCP server events to beta Realtime client event union

The beta Realtime client (`client.beta.realtime.connect()`) uses
`types/beta/realtime/realtime_server_event.py` as the discriminated union
for parsing incoming WebSocket events. This union was missing all eight MCP
lifecycle event types that the server emits when MCP tools are configured:

  mcp_list_tools.in_progress
  mcp_list_tools.completed
  mcp_list_tools.failed
  response.mcp_call.in_progress
  response.mcp_call.completed
  response.mcp_call.failed
  response.mcp_call_arguments.delta
  response.mcp_call_arguments.done

Because the discriminated union had no entry for these event types, any MCP
event sent by the server could not be matched during parse_event(), causing
pydantic to fail silently or raise a validation error. The practical effect
is that MCP tool calls appear to do nothing: the server executes the tool,
emits the lifecycle events, and the client drops them without dispatch.

The same types already exist in `types/realtime/` (the non-beta path) and
are fully covered there. This commit re-exports them into
`types/beta/realtime/realtime_server_event.py` by importing from the shared
location and registering them in both `__all__` and the `RealtimeServerEvent`
union.

Fixes #3128

Author: SanskaarUndale21

src/openai/types/beta/realtime/realtime_server_event.py

@@ -38,13 +38,29 @@
 from .conversation_item_input_audio_transcription_completed_event import (
     ConversationItemInputAudioTranscriptionCompletedEvent,
 )
+from ...realtime.mcp_list_tools_in_progress import McpListToolsInProgress
+from ...realtime.mcp_list_tools_completed import McpListToolsCompleted
+from ...realtime.mcp_list_tools_failed import McpListToolsFailed
+from ...realtime.response_mcp_call_arguments_delta import ResponseMcpCallArgumentsDelta
+from ...realtime.response_mcp_call_arguments_done import ResponseMcpCallArgumentsDone
+from ...realtime.response_mcp_call_in_progress import ResponseMcpCallInProgress
+from ...realtime.response_mcp_call_completed import ResponseMcpCallCompleted
+from ...realtime.response_mcp_call_failed import ResponseMcpCallFailed
 
 __all__ = [
     "RealtimeServerEvent",
     "ConversationItemRetrieved",
     "OutputAudioBufferStarted",
     "OutputAudioBufferStopped",
     "OutputAudioBufferCleared",
+    "McpListToolsInProgress",
+    "McpListToolsCompleted",
+    "McpListToolsFailed",
+    "ResponseMcpCallArgumentsDelta",
+    "ResponseMcpCallArgumentsDone",
+    "ResponseMcpCallInProgress",
+    "ResponseMcpCallCompleted",
+    "ResponseMcpCallFailed",
 ]
 
 
@@ -128,6 +144,14 @@ class OutputAudioBufferCleared(BaseModel):
         OutputAudioBufferStarted,
         OutputAudioBufferStopped,
         OutputAudioBufferCleared,
+        McpListToolsInProgress,
+        McpListToolsCompleted,
+        McpListToolsFailed,
+        ResponseMcpCallArgumentsDelta,
+        ResponseMcpCallArgumentsDone,
+        ResponseMcpCallInProgress,
+        ResponseMcpCallCompleted,
+        ResponseMcpCallFailed,
     ],
     PropertyInfo(discriminator="type"),
 ]