export const MODEL_OPTIONS = [  "gpt-5.3-codex",  "gpt-5.3-codex-spark",  "gpt-5.2-codex",  "gpt-5.2",] as const; export const DEFAULT_MODEL = "gpt-5.3-codex"; export const MODEL_SLUG_ALIASES: Record<string, string> = {  "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): string | 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): string {  const normalized = normalizeModelSlug(model);  if (!normalized) {    return DEFAULT_MODEL;  }   return MODEL_OPTIONS.includes(normalized as (typeof MODEL_OPTIONS)[number])    ? normalized    : DEFAULT_MODEL;}