File codex.test.ts

tests/adapters/codex.test.ts:None–None

import "../setup-home";
import { describe, it, expect, beforeEach } from "vitest";
import { execFileSync } from "node:child_process";
import { existsSync, mkdirSync, mkdtempSync, readFileSync, readdirSync, rmSync, writeFileSync } from "node:fs";