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The file indexing system has been completely rewritten from a synchronous native Rust module (file-index.node) to an asynchronous pure JavaScript implementation. The new loadFromFileListAsync() method returns { queryable: Promise, done: Promise }, allowing the UI to remain responsive during index rebuilds. Log messages now reference generic "index" instead of "Rust index".
Evidence
Async file index (search for "[FileIndex] rebuilt index with")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.