Adds the on-disk content and thumbnail cache keyed by fileID: originals/ and thumbnails/ under cacheDirectory, present-means-complete (streaming atomic rename), orphan temp reaping on open. Photo.original/thumbnail return a cached path with no network when present, else fetch through the shared request pool; thumbnails.ensure drives the thumbnail pool with priority, dedup and AbortSignal. One shared RequestPools set serves both the ML fetch and the content cache. Content-hash integrity is deferred (#68); authenticated streaming decrypt guarantees integrity now.
Model: opus-4-8
Adds the in-process read surface, served from RAM with args-object signatures: albums (list/byName/byID), photos (byID/records -> plain PhotoRecord[]), thin Album/Photo wrappers, and timeline.groups (day/week/month) with a PhotoFilter (albumID/text/fileTypes/hasLocation/includeArchived; hidden excluded). Week keys use ISO YYYY-Www; each file appears once per group, newest first. Built on the #43 snapshot projection; no network.
Model: opus-4-8
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