// operation_runtime.mjs
export async function callTool({catalog,journal,actorScopes,operationId,name,args={}}) {
  const tool = catalog.get(name);
  requireScopes(tool, actorScopes);
  const digest = requestDigest({tool:name,args});
  const started = journal.begin(operationId,digest);
  if (started.status === "completed") return started;
  if (started.replayed && started.status === "pending") throw Error("reconcile_before_retry");
  return journal.complete(operationId, await tool.handler(structuredClone(args)));
}