tests/draft22_roundtrip.rs: a seeded generator builds valid control
messages of every type, subgroup and fetch streams in both Group Orders,
datagrams and WAI_RECEIPT values; encode, decode, encode is the identity.
The encodings and the corpus, mutated, are fed to every decoder, whole and
incrementally; none may panic.
joule-code-conformance runs the independent decoder over the corpus.
Co-Authored-By: Claude Opus 5.5 <[email protected]>