The writer refuses a write that would change which type an existing record resolves to, unless
the entries of both the existing records and the written ones own the id (a rename; the registered
descriptor wins). Tests pin the arrived-overwrites-registered guard in both id orders, the
content-hash tie-break against the compatible-list order, sorted id processing and the cross-tier
refusal; a cross-runtime test has TS write a schema renamed under a stable id and TS, Rust and
Python open it.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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