Add experimental thread prediction protocol types (#49480)

## What changed

Define `thread/prediction/request` with `threadId` and `sourceTurnId`, and `thread/prediction/updated` with a `completed` result containing optional text or a `failed` result.

Update generated JSON schemas, TypeScript types, and Python notification models. Route prediction notifications to their thread in the TUI and ignore them in the chat widget.

The request remains unimplemented and returns a method-not-found error.

GitOrigin-RevId: 09922f583d5c56f808d018121c651dcd92734515

sdk/python/src/openai_codex/generated/notification_registry.py

@@ -61,6 +61,7 @@ from .v2_all import ThreadDeletedNotification
 from .v2_all import ThreadGoalClearedNotification
 from .v2_all import ThreadGoalUpdatedNotification
 from .v2_all import ThreadNameUpdatedNotification
+from .v2_all import ThreadPredictionUpdatedNotification
 from .v2_all import ThreadProjectUpdatedNotification
 from .v2_all import ThreadQueueChangedNotification
 from .v2_all import ThreadRealtimeClosedNotification
@@ -144,6 +145,7 @@ KnownNotificationPayload: TypeAlias = (
     | ThreadGoalClearedNotification
     | ThreadGoalUpdatedNotification
     | ThreadNameUpdatedNotification
+    | ThreadPredictionUpdatedNotification
     | ThreadProjectUpdatedNotification
     | ThreadQueueChangedNotification
     | ThreadRealtimeClosedNotification
@@ -230,6 +232,7 @@ NOTIFICATION_MODELS: dict[str, type[KnownNotificationPayload]] = {
     "thread/goal/cleared": ThreadGoalClearedNotification,
     "thread/goal/updated": ThreadGoalUpdatedNotification,
     "thread/name/updated": ThreadNameUpdatedNotification,
+    "thread/prediction/updated": ThreadPredictionUpdatedNotification,
     "thread/project/updated": ThreadProjectUpdatedNotification,
     "thread/queue/changed": ThreadQueueChangedNotification,
     "thread/realtime/closed": ThreadRealtimeClosedNotification,

sdk/python/src/openai_codex/generated/v2_all.py

@@ -5613,6 +5613,39 @@ class ThreadNameUpdatedNotification(BaseModel):
     thread_name: Annotated[str | None, Field(alias="threadName")] = None
 
 
+class CompletedThreadPredictionResult(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    text: str | None = None
+    type: Annotated[Literal["completed"], Field(title="CompletedThreadPredictionResultType")]
+
+
+class FailedThreadPredictionResult(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    type: Annotated[Literal["failed"], Field(title="FailedThreadPredictionResultType")]
+
+
+class ThreadPredictionResult(
+    RootModel[CompletedThreadPredictionResult | FailedThreadPredictionResult]
+):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    root: CompletedThreadPredictionResult | FailedThreadPredictionResult
+
+
+class ThreadPredictionUpdatedNotification(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    result: ThreadPredictionResult
+    source_turn_id: Annotated[str, Field(alias="sourceTurnId")]
+    thread_id: Annotated[str, Field(alias="threadId")]
+
+
 class ThreadProjectUpdatedNotification(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
@@ -9178,6 +9211,24 @@ class ThreadAttachmentUpdatedServerNotification(BaseModel):
     params: ThreadAttachmentUpdatedNotification
 
 
+class ThreadPredictionUpdatedServerNotification(BaseModel):
+    model_config = ConfigDict(
+        populate_by_name=True,
+    )
+    emitted_at_ms: Annotated[
+        int | None,
+        Field(
+            alias="emittedAtMs",
+            description="Unix timestamp (in milliseconds) when app-server emitted this notification.",
+        ),
+    ] = None
+    method: Annotated[
+        Literal["thread/prediction/updated"],
+        Field(title="Thread/prediction/updatedNotificationMethod"),
+    ]
+    params: ThreadPredictionUpdatedNotification
+
+
 class ThreadGoalClearedServerNotification(BaseModel):
     model_config = ConfigDict(
         populate_by_name=True,
@@ -12859,6 +12910,7 @@ class ServerNotification(
         | ThreadNameUpdatedServerNotification
         | ThreadAttachmentUpdatedServerNotification
         | ThreadGoalUpdatedServerNotification
+        | ThreadPredictionUpdatedServerNotification
         | ThreadGoalClearedServerNotification
         | ThreadQueueChangedServerNotification
         | ProjectChangedServerNotification
@@ -12948,6 +13000,7 @@ class ServerNotification(
         | ThreadNameUpdatedServerNotification
         | ThreadAttachmentUpdatedServerNotification
         | ThreadGoalUpdatedServerNotification
+        | ThreadPredictionUpdatedServerNotification
         | ThreadGoalClearedServerNotification
         | ThreadQueueChangedServerNotification
         | ProjectChangedServerNotification