feat(cache): add content-addressed disk store#11
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Adds a provider-neutral cache service interface with an XDG-compatible disk-backed implementation for verified blob downloads. Covers cache hits, unknown digests, corrupt entries, validation errors, cancellation, mismatch handling, read-only blobs, and unsafe cache paths.
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Summary
internal/cachewith a provider-neutralServiceinterface and disk-backedDiskStoreimplementation.blobs/sha256/<prefix>/<digest>with temp downloads undertmp/.Validation
go test -count=1 ./internal/cachemoon run root:check --summary minimalNotes
Provider integration is intentionally deferred; IncusOS can wire into
cache.Service.Fetchin a later slice.