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Drop fromKebabKeys; carry every speller config key through the mirror The helper existed so a pipeline could spread the wire-format speller config over these bindings' typed options, but it returned any, so it erased the config's type checking rather than bridging it — and being a generated export, it only existed in binaries newer than the builder running the job, which is how it broke the sme grammar checker. Gone; pipelines cast the imported JSON to the generated type instead, which type-checks their overrides for real. The mirror also declared continuation-marker where the speller has completion-marker, and lacked boundary-edit-weight entirely, so serde dropped both from every grammar checker: sme's measured boundary edit weight never reached the pipeline it was tuned for. The mirror now matches the speller's own config, and a test fails if a key it carries ever stops surviving the round trip.