Example script: download every album's photos and metadata (closes #144)

`examples/download-albums.ts` logs in from `QUAK_EMAIL` and `QUAK_PASSWORD`, then walks every album from `await lib.fresh()`. For each photo it runs `photo.download()` to the photo's save path and writes `{savePath}.json`, which holds the photo's record and EXIF. For each album it writes `{dir}/albums/{collectionID}.json` with the album's name and its photos' save paths. A file is written only when its content changes, so a second run downloads and rewrites nothing.

The script opens the library with prefetching off, as `quak backup` does. The build type-checks `examples/`. The README says how to run it.

Model: opus-5-5
Co-authored-by: clawbot <sneak+clawbot@sneak.cloud>

TODO.md

@@ -25,6 +25,12 @@ declares one.
 
 # Completed Steps
 
+- 2026-10-01: `examples/download-albums.ts` logs in, opens the library, and for
+  every album downloads each photo to its save path, writes the photo's record
+  and EXIF fields to a JSON file beside it, and writes the album's photos to
+  `albums/<collectionID>.json` (issue 144). The build compiles it to
+  `dist/examples/`; the README's "Examples" section says how to run it.
+
 - 2026-10-01: A `Photo` has one async method for each field of `exif()`, named
   and typed as in `PhotoExif`: `make()`, `model()`, `lensModel()`,
   `dateTimeOriginal()`, `offsetTimeOriginal()`, `exposureTime()`, `fNumber()`,