sjon_format_unsupported

Retired: manifests no longer declare a format version; this code is never emitted.

Manifests once carried (plugin … :sjon "1.x"), a declared format version the host compared against its own ceiling and refused when the manifest’s was higher. The key never enabled anything on the host reading it. Every feature the host had was on regardless, so it was removed. SJON has one version, the release, and the CHANGELOG says which release a manifest keyword arrived in.

A manifest newer than the host reading it still fails loudly: every meta-schema form is closed, so an unknown keyword or declaration head is unknown_key / unknown_form at meta-validation and the plugin is dropped. A leftover :sjon key reports the same way. The code stays in the wire-stable enum and is asserted silent by a tombstone test.

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Run sjon explain sjon_format_unsupported to read this at a terminal, browse every code, or work through diagnostics-driven repair if you want the habit rather than the answer.