DECLARATIVE-YAML-01: Validate one required frontmatter field by type

What it demonstrates

A minimal contract document (mcVersion 1, kind contract) that requires a single typed frontmatter field.

Builds on: nothing — this is the first rung of Declarative YAML: Contracts and Corpus Config, No Code.

How it’s done

The declarative YAML artifact, verbatim — no code required.

mcVersion: 1
kind: contract
frontmatter:
  fields:
    title:
      type: string

Surfaces exercised

• loadContract / loadContractFile
• compileFrontmatter -> compileObjectSchema
• type: string -> z.string()