Write a persistent feature/change spec under `.ai/runs/` before planning or coding. Opens with a skeleton plus numbered Open Questions and HARD STOPS until you answer them, so wrong assumptions surface before they cost a rewrite. Reads stack, commands and patterns from the project — never assumes a framework. Use when starting a new feature, ticket, or non-trivial change, or when someone says "spec this out", "write a spec", "define requirements".
