/** * CheckpointDiffQuery - Query interface for computed checkpoint diffs. * * Provides read-only diff operations across checkpoint snapshots used by * orchestration APIs. * * @module CheckpointDiffQuery */import type {  OrchestrationGetFullThreadDiffInput,  OrchestrationGetFullThreadDiffResult,  OrchestrationGetTurnDiffInput,  OrchestrationGetTurnDiffResult,} from "@t3tools/contracts";import { Context } from "effect";import type { Effect } from "effect"; import type { CheckpointServiceError } from "../Errors.ts"; /** * CheckpointDiffQueryShape - Service API for checkpoint diff queries. */export interface CheckpointDiffQueryShape {  /**   * Read the patch diff for a single turn checkpoint transition.   *   * Verifies checkpoint availability in both projection state and filesystem.   */  readonly getTurnDiff: (    input: OrchestrationGetTurnDiffInput,  ) => Effect.Effect<OrchestrationGetTurnDiffResult, CheckpointServiceError>;   /**   * Read the full patch diff across a thread range of checkpoints.   *   * Delegates to turn diff with `fromTurnCount = 0`.   */  readonly getFullThreadDiff: (    input: OrchestrationGetFullThreadDiffInput,  ) => Effect.Effect<OrchestrationGetFullThreadDiffResult, CheckpointServiceError>;} /** * CheckpointDiffQuery - Service tag for checkpoint diff queries. */export class CheckpointDiffQuery extends Context.Service<  CheckpointDiffQuery,  CheckpointDiffQueryShape>()("t3/checkpointing/Services/CheckpointDiffQuery") {}