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Add the Library surface over the on-disk metadata store. open() loads the
cache, runs one refresh, then a background timer refreshes every
refreshIntervalSeconds (default 3). Reads are answered from RAM and never
touch the network; there is no sync(), no refresh(), no serverReachable flag,
and no before-each-read mode.
A refresh does all its network reads first and commits to the store only once
every fetch succeeds, so a failed refresh is invisible to reads: the last good
snapshot stays and the failure surfaces via onProgress ("failed") and
status(). The cache is rewritten only when something actually changed.
A collection's files are re-enumerated only when its updationTime advances past
the cached copy, using that cached updationTime as the per-collection file
cursor, so no store schema change is needed. Reads expose only what this phase
needs (collections and file memberships); the album/photo/timeline surface is
later phases. Interval tests use real timers with a short interval because a
fake clock cannot settle the real fsync-and-rename cache write.
Model: opus-4-8