DECLARATIVE-YAML-08: Optional, alias, oneOf and gap section nodes

What it demonstrates

The remaining body-node vocabulary — optional sections, heading aliases, a oneOf choice, and a gap allowance.

Builds on: DECLARATIVE-YAML-07: Declare required body sections

How it’s done

The declarative YAML artifact, verbatim — no code required.

body:
  order: recognized-relative
  sections:
    - section: Summary
      aliases: [Overview, TL;DR]
    - oneOf: [Decision, Proposal]
    - section: Out of scope
      optional: true
    - gap: { min: 0, max: 2 }

Surfaces exercised

• compileNode: section(names with aliases)
• oneOf()
• optional(spec)
• gap({min,max})