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Add src/library/content.ts: a ContentCache keyed by fileID under cacheDirectory (flat originals/ and thumbnails/, 0700/0600). It fetches through the request pools (#45) and the streaming decrypt / atomic writer (#40), so present-means-complete; it reaps orphan temp files at open and records the record of what is cached. Photo.original/thumbnail return {path,bytes} (one skipped event when present, in cache or downloadDirectory), and lib.thumbnails.ensure drives the thumbnail pool with priority, dedup, and abort. Cached paths are projected onto PhotoRecord. Integrity: enforced by the reused streaming decrypt (every chunk authenticated, renamed in only on TAG_FINAL) plus a non-empty check. The metadata.hash / declared-fileSize comparison is deferred — the only in-repo hash fixture is a placeholder, so the construction cannot be confirmed against fixtures (the issue's own precondition), and FileBlob.size is the encrypted object size, not the decrypted length. Raised as a question on the PR. Judgement call: the three thumbnail priorities map onto the pool's two tiers (visible -> on-demand; ahead and background -> background). Model: opus-4-8