/spec-write <feature-id> <title>
Register a spec file in the manifest, validate its structure, and update indexes. This is the mechanical registration step — run it after /spec-author has produced the hardened spec content, or when registering a prerequisite stub.
For authoring hardened specs with adversarial review, use /spec-author first, then /spec-write to register the output.
Canonical frontmatter schema: .spec/_refs/frontmatter.md is the single authoritative reference for
[Description truncada. Veja o README completo no GitHub.]