import * as Encoding from "effect/Encoding";import { CheckpointRef, ProjectId, type ThreadId } from "@t3tools/contracts"; export const CHECKPOINT_REFS_PREFIX = "refs/t3/checkpoints"; export function checkpointRefForThreadTurn(threadId: ThreadId, turnCount: number): CheckpointRef {  return CheckpointRef.make(    `${CHECKPOINT_REFS_PREFIX}/${Encoding.encodeBase64Url(threadId)}/turn/${turnCount}`,  );} export function resolveThreadWorkspaceCwd(input: {  readonly thread: {    readonly projectId: ProjectId;    readonly worktreePath: string | null;  };  readonly projects: ReadonlyArray<{    readonly id: ProjectId;    readonly workspaceRoot: string;  }>;}): string | undefined {  const worktreeCwd = input.thread.worktreePath ?? undefined;  if (worktreeCwd) {    return worktreeCwd;  }   return input.projects.find((project) => project.id === input.thread.projectId)?.workspaceRoot;}