Conformance

Conformance The adapter interface, the runner, and the four things the suite checks.
The fixture format The three kinds of conformance fixture, expression, project and round-trip, with an example of each from spec/fixtures/.
Coverage and the uncovered list The two-directional coverage gate, and what spec/fixtures/UNCOVERED.md is for.
The chant cross-check Running the fixtures against chant through its public fold API, pinned to a release.
The corpus cross-check Running chant's whole example corpus through both implementations, the two named limits, and what the numbers mean.