register_document_type refuses a document whose own or compatible ids overlap
another registered document's, raising SchemaConflictError (empty record key,
both schema names, a message naming both document types), as TypeScript does.
Before, the record resolved to whichever document the dict held first (Soul F4).
With one carrier per id, resolution by id is a single pass. SchemaConflictError
takes an optional message for this use.
The test that pinned owner-over-lister resolution inside one cache becomes a
refusal test in both orders; shared compatible ids and a shared own id (neither
declaring its own) are refused in both orders.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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