// StreamingWorkspace.tsx
type StreamPhase = "idle" | "streaming" | "cancelling" | "reconciling" | "complete" | "failed";
async function consume(response: Response, operationId: string) {
  if (!response.ok || !response.body) throw new Error("stream_failed");
  const reader = response.body.getReader();
  // Incremental output is visible before terminal state; cancellation reconciles the same operation identity.
}