Function removeEphemeralMessage

src/browser/stores/WorkspaceStore.ts:4768–4775

(workspaceId: string, messageId: string)

 * Used for dismissing frontend-only messages like /plan output.
 */
export function removeEphemeralMessage(workspaceId: string, messageId: string): void {
  const store = getStoreInstance();
  const aggregator = store.getAggregator(workspaceId);
  if (aggregator) {
    aggregator.removeMessage(messageId);
    store.bumpState(workspaceId);
  }
}

/**
 * Hook for usage metadata (instant, no tokenization).