// Types needed by EngineService are defined belowimport type { Recipe, ProcessInfo } from "../models/types";import type { ModelDownload } from "../shared/recipe-types"; export type { Recipe, ProcessInfo };export type { ModelDownload }; export type RuntimeType = "vllm" | "sglang" | "llamacpp" | "exllamav3" | "cuda" | "rocm";export type RuntimeInfo = {  installed: boolean;  version: string | null;  python_path?: string | null | undefined;  binary_path?: string | null | undefined;  upgrade_command_available: boolean;};export type UpgradeResult = {  success: boolean;  version: string | null;  output: string | null;  error: string | null;  used_command: string | null;}; export interface DownloadRequest {  model_id: string;  revision?: string | null;  destination_dir?: string | null;  allow_patterns?: string[] | null;  ignore_patterns?: string[] | null;  hf_token?: string | null;} export interface DownloadHandle {  id: string;  model_id: string;  status: string;} export interface DownloadStatus {  id: string;  model_id: string;  status: string;  downloaded_bytes: number;  total_bytes: number | null;  error: string | null;} export interface HfModel {  id: string;  name?: string;  description?: string;} export interface EnsureActiveResult {  switched: boolean;  error: string | null;} export interface EnsureActiveOptions {  force_evict?: boolean;  publish_events?: boolean;} export type SetActiveRecipeResult = { ok: true } | { ok: false; error: string }; /** Options for setting the active recipe. */export interface SetActiveRecipeOptions {  signal?: AbortSignal;} /** * The single public contract for the engines module. * All consumers (HTTP routes, other modules, tests) use this interface. */export interface EngineService {  // Lifecycle  setActiveRecipe(    recipe: Recipe | null,    options?: SetActiveRecipeOptions  ): Promise<SetActiveRecipeResult>;  ensureActive(recipe: Recipe, options?: EnsureActiveOptions): Promise<EnsureActiveResult>;   // State queries  getCurrentRecipe(): Recipe | null;  getCurrentProcess(): Promise<ProcessInfo | null>;   // Downloads  startDownload(request: DownloadRequest): Promise<ModelDownload>;  pauseDownload(downloadId: string): ModelDownload;  resumeDownload(downloadId: string, hfToken?: string | null): ModelDownload;  cancelDownload(downloadId: string): ModelDownload;  listDownloads(): ModelDownload[];  getDownload(downloadId: string): ModelDownload | null;   // HuggingFace  searchHuggingFace(query: string, hfToken?: string | null): Promise<HfModel[]>;   // Runtimes  listRuntimes(): Record<string, RuntimeInfo>;  upgradeRuntime(    runtime: RuntimeType,    options?: { version?: string; args?: string[] }  ): Promise<UpgradeResult>;  getRuntimeHelp(    runtime: "vllm" | "llamacpp"  ): Promise<{ config: string | null; error: string | null }>;}