v0.9.0

Added

• A type declares the keys of its own export line. export.parts.line: in .schema/<type>.yaml names the keys one
  part writes and the source filling each, drawn from a closed vocabulary covering a part's text, its body, its modal,
  a frontmatter field and a table column. kac export reads that declaration and names no key itself, so a second type
  exporting parts costs no code. Glossary is the type that declares one, and its terms.jsonl is byte for byte what it
  was.

• Each type states its own shape version in the export manifest. export.version: in the schema reaches the
  manifest as shapeVersion on that type's entry. formatVersion covers the envelope alone, so a key added to one
  type's line cannot refuse a consumer reading another.

• kac bundle refuses a component reading a type at a shape the export does not carry. A requires entry may name
  the shape, as glossary@1. A bare glossary asks for the type and opens none of its files. Either is trimmed, as
  before, where the export carries no such type at all.

• kac validate reports a line: that would export nothing. A key with no source, a source nothing fills, a
  front. naming a field no record carries, a column. naming a header the type does not declare, and a part.lead
  or part.aside against a table row are each an error. So is an export: block with no version:.

Changed

• export.parts: in a type's schema is a block, and the fidelity moves inside it. export.parts: full becomes
  export.parts.fidelity: full with line: beside it. kac validate reports a type file still carrying the older
  form, naming the fidelity, the line: and the version: it lacks.