Adds Library.fresh(): forces a refresh, awaits its completion and persist, then returns the albums/photos/timeline read namespaces now reflecting a completed server round trip — the caller awaits and is guaranteed current at resolve. Default reads and the background loop are unchanged (immediate-from-cache). Concurrent fresh reads coalesce to one in-flight refresh; a fresh read whose refresh fails rejects rather than answering stale. The CLI adopts fresh reads separately (#52).
Model: opus-4-8
