import type { OrchestrationThread } from "@t3tools/contracts";import * as Option from "effect/Option"; export type EnvironmentThreadStatus = "empty" | "cached" | "synchronizing" | "live" | "deleted"; /** * Pagination state for a windowed thread. Present only when the loaded thread * is a window (the server returned `page` metadata); absent means the thread is * fully loaded — either the server predates pagination or the window reached * the top. */export interface EnvironmentThreadPageState {  /** Opaque exclusive cursor for the next older slice; null when fully loaded. */  readonly beforeCursor: string | null;  readonly hasMore: boolean;  /** True while an older page fetch is in flight. */  readonly loadingOlder: boolean;} export interface EnvironmentThreadState {  readonly data: Option.Option<OrchestrationThread>;  readonly status: EnvironmentThreadStatus;  readonly error: Option.Option<string>;  readonly page: Option.Option<EnvironmentThreadPageState>;} export const EMPTY_ENVIRONMENT_THREAD_STATE: EnvironmentThreadState = {  data: Option.none(),  status: "empty",  error: Option.none(),  page: Option.none(),}; /** Whether the thread has older turns that can be loaded with more pages. */export function threadHasOlderTurns(state: EnvironmentThreadState): boolean {  return Option.match(state.page, {    onNone: () => false,    onSome: (page) => page.hasMore,  });}