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b0ac30039b
The IDL `types` array was emitted in HashMap iteration order by spel-framework-core, which is non-deterministic across processes. Two independent regenerations of the same source could therefore disagree on type ordering, producing different bytes. This is what makes the check-idl CI job flaky: a PR's committed IDL is generated locally with one ordering, but CI regenerates with a different ordering and the diff fails — including PRs that were green when posted then breaking main after merge. Sort the top-level `types` array by name before serializing so output is byte-stable regardless of where idl-gen runs. Enable serde_json's `preserve_order` feature so the Value round-trip preserves struct-field key order (otherwise all keys would alphabetize and churn every artifact). Only top-level `types` was unstable; variants and fields already follow source order. Committed artifacts are unchanged — they happened to already be in sorted order.