The Second Time Is a Bug Companion Code

This repository provides companion code for the book 'The Second Time Is a Bug', a workbook focused on engineering with AI coding agents. It includes a small invoicing application example, legacy exporters, various guards scripts, reproducible drills to catch common agent mistakes, templates, and an experiment kit for testing. The code is implemented in TypeScript for Node.js, designed without runtime dependencies, and includes test suites and browser accessibility checks.