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Library.close() now returns a promise that resolves once an in-flight refresh, including its cache write, has finished. A refresh changes RAM before it writes the cache file, so the interval test could see the new state, close, and remove the directory while the write was still running. The library tests now await close(). The precache test waited for its stub source to be called, but the cache records a file only after checking it on disk, so status() could lag. It now waits for both fills to report "done". Model: opus-5-5