spec-driven-development

Full reference for spec-driven development on brownfield code. Use when writing, drafting, reviewing, auditing, or evolving a specification before code; when the user says spec-first, spec-driven, the spec is the source of truth, write a spec, draft a specification, review my spec, is this spec valid, spec out X, напиши спеку, составь спецификацию, спека первой, написать ТЗ, or описать в спеке. Covers typed normative templates, three gates, Brownfield baseline, Discovery scope, Delta, Migration, Surface semver, Policy, Contract, Invariant, Open-Q, ASSUMPTION, test obligations, and what belongs in the spec versus what the agent decides.