`Photo` gains:
- `savePath` and `isLocal`: synchronous, disk only. Where `lib.backup()` writes the original under the library's `downloadDirectory`, and whether all of it is there; a copy only in the cache does not count.
- `content()` and `exif()`: async, may download. `exif()` reads the common EXIF fields of a JPEG and returns `{}` for anything else.
- The getters `modifiedAt` and `hash`, also on `PhotoRecord`, and `year`.
For a live photo the backup has not stored yet, `savePath` carries the title's extension, and the image may be stored under a different one. The JPEG EXIF scan moved to `src/exif.ts`. The exported `PhotoContent` interface gains `savePath` and `isLocal`.
Judgement call: `iso` is read only when the file stores it as a single number.
Model: opus-5-5
Library.close() now returns a promise that resolves once the work it
started has finished: an in-flight refresh with its cache write, the ML
data fetch, and running precache sweeps. The interval test could see a
refresh's new state, close, and remove the directory while the write was
still running. Every library test and CLI command now awaits close(), and
tests hold each of the three writes open to prove close() waits for it.
The precache test waited for its stub source to be called, but the cache
records a file only after checking it on disk, so status() could lag. It
now waits for both fills to report "done".
Model: opus-5-5
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