Pull a reduced end-to-end smoke forward into the slice so the view flow
is exercised over a real on-disk recipe, not just a temp file.
Add fixtures/prose.md — a recipe using only this slice's modelled
constructs (frontmatter, headings, plain paragraphs) so it renders
losslessly. integration_test now runs `kitchen view fixtures/prose.md`
as a subprocess and asserts the frontmatter, separator, headings,
paragraphs, and flat document order end-to-end. smoke_test covers
`kitchen --help` exiting 0 with the view command listed.
The full fixtures/basic.md smoke remains task 0007, which needs 0004's
richer nodes before that fixture renders losslessly.
Cut the first complete thread through both layers with the smallest set
of node types.
@kitchen-md/core gains a pure, total `parse` returning a
`DocumentAST` of `{ frontmatter, blocks, diagnostics }`, built from a
minimal remark pipeline (remark-parse + remark-frontmatter) with an
internal translation layer to core's own types. This slice models
frontmatter passthrough, HeadingBlock, ParagraphBlock, and TextNode;
remark's mdast does not surface in the public API.
@kitchen-md/bin gains the `view` subcommand (commander) that reads a
file, calls `parse`, and passes the AST to a pure `render` that returns
an ANSI-styled string via chalk (auto-suppressed off a TTY). Frontmatter
prints as raw YAML followed by a separator, headings styled distinctly
by level, paragraphs as prose. A missing argument prints usage and a
missing/unreadable file a human-readable error, both exiting 1.
Richer blocks/inline plus raw fallbacks are task 0004; malformed
frontmatter diagnostics and the basic.md smoke test are task 0007.
