Two markdown fixtures with hand-authored JSON baselines that pin the
§0 Q9 derive output across runs:
- frontmatter-only.md exercises the YAML happy path with most fields,
unknown keys, an `id:` field, and a non-UTC created_at (so the
baseline shows original_timestamps preservation).
- mixed-lang.md is body-only with no `lang:` field; baseline pins the
lingua autodetect result for our enabled language set.
A separate `emit_snapshots` test (marked `#[ignore]`) regenerates the
baselines from the current parser output. A determinism test parses
the fixture twice and asserts equality so any non-determinism (e.g.
key ordering, lingua nondeterminism) fails fast.
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