refactor(platform): Phase 733 multi-scope index preamble namespaces
Add sharedScope, localScope, searchScope, and integrationScope usage in index.js with preamble block extraction and body-only codemod. Keep id, now, and guildTopic as local bindings to avoid shadowing collisions. Add platform-index-integration-imports.js. No behavior changes. Co-authored-by: Cursor <[email protected]>
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