BridgeJS: Remove `@JS protocol` in favor of `@JSClass struct`#560

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kateinoigakukun wants to merge 2 commits intomainfrom

katei/5b06-remove-js-protoc

Commits on Feb 3, 2026

Removed `@JS protocol` support and migrated guidance/tests to `@JSClass` interfaces.
kateinoigakukun
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Added runtime coverage for the removed `@JS protocol` flows using `@JSClass`:
kateinoigakukun
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