export interface DshUserMessage {
  /** 每条待处理消息的唯一标识；inbox 投影按它去重，缺了会报 `message "undefined" is already pending`。 */
  id: string;
  role: 'user';
  content: { type: 'text'; text: string }[];
  source: { kind: 'user' };
}

export function userMessage(text: string): DshUserMessage;
export function stripRe(subject: string): string;
export function replySubject(subject: string, fallback?: string): string;
export function lastAssistantText(events: readonly any[]): string;
export function modelTitle(events: readonly any[]): string;