Spec-Driven, AI-Assisted, Test-Validated — A Practitioner's Account

What made a two-week typesetting library possible, and what the methodology still lacks §0 - Hook Most accounts of AI-assisted development describe tools and workflows. Very few show primary sources: the actual specification documents, the actual errors caught, the actual decisions revised under implementation pressure. Without those, the account is not evaluable and not replicable. You cannot tell whether the methodology produced the result or whether the result happened despite the methodology. This article shows the sources.