export const MODEL_OPTIONS = [  { slug: "gpt-5.3-codex", name: "GPT-5.3 Codex" },  { slug: "gpt-5.3-codex-spark", name: "GPT-5.3 Codex Spark" },  { slug: "gpt-5.2-codex", name: "GPT-5.2 Codex" },  { slug: "gpt-5.2", name: "GPT-5.2" },] as const; export type BuiltInModelSlug = (typeof MODEL_OPTIONS)[number]["slug"];export type ModelSlug = string; export const DEFAULT_MODEL = "gpt-5.3-codex"; export const MODEL_SLUG_ALIASES: Record<string, BuiltInModelSlug> = {  "5.3": "gpt-5.3-codex",  "gpt-5.3": "gpt-5.3-codex",  "5.3-spark": "gpt-5.3-codex-spark",  "gpt-5.3-spark": "gpt-5.3-codex-spark",}; export function normalizeModelSlug(model: string | null | undefined): ModelSlug | null {  if (typeof model !== "string") {    return null;  }   const trimmed = model.trim();  if (!trimmed) {    return null;  }   return MODEL_SLUG_ALIASES[trimmed] ?? trimmed;} export function resolveModelSlug(model: string | null | undefined): ModelSlug {  const normalized = normalizeModelSlug(model);  return normalized ?? DEFAULT_MODEL;} export const REASONING_OPTIONS = ["xhigh", "high", "medium", "low"] as const;export type ReasoningEffort = (typeof REASONING_OPTIONS)[number];export const DEFAULT_REASONING: ReasoningEffort = "high";