I built an OpenAPI changelog generator because writing API release notes was eating my afternoons: diff two specs, output a structured list of breaking changes, no LLM rewriting history. First real dogfood run — comparing my own API's v3 spec against v2 — it flagged exactly one breaking change. Except that change had shipped a week earlier and nothing broke. The delta: a status field's enum went from ["queued","shipped","failed"] to ["queued","shipped"] . Textbook breaking change, the di...