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
Precaches aggressively inside open(): every thumbnail (newest first, through the shared thumbnail pool, never evicted; visible/ahead requests preempt the background fill) and the pinned originals — the favorites album plus every file within precacheOriginalsDays (default 7) of the newest takenAt — through the content pool. The pinned set integrates with the #47 eviction hook; when the window moves or a favorite is removed, files become ordinary evictable originals. open() options precacheThumbnails/precacheOriginals/precacheOriginalsDays; progress via onProgress/status().
Model: opus-4-8