Deleting the generator exposed that its codec was the only writer for documents
without [MessagePackObject], and that it named nested member types with a dot
where reflection uses a plus. Operator decisions: the registry requires
[MessagePackObject] on every [CultDocument], and nested type names keep the
reflection form once a store scan shows no persisted record uses the dot form.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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