Download-albums example test no longer depends on the disk's free space (closes #160)

The test left freeBelowBytes at its 50 GiB default, so on a disk with under
50 GiB free the content cache's limit fell to zero. Downloading another photo
then evicted photo 1's cached original, and the test fetched it a fourth time
instead of copying it. Both of its libraries now open with freeBelowBytes: 0.
Every other test that opens a library or content cache with the real free
space was read; none has a result that depends on it. The 50 GiB default is
unchanged.

Model: opus-5-5

TODO.md

@@ -25,6 +25,12 @@ declares one.
 
 # Completed Steps
 
+- 2026-10-03: The download-albums example test no longer fails on a disk with
+  under 50 GiB free (issue 160). It opens its libraries with
+  `freeBelowBytes: 0`, so the free space of the disk it runs on cannot shrink
+  the cache, evict the original it cached and add a fetch to the count. No other
+  test's result depends on that free space. The 50 GiB default is unchanged.
+
 - 2026-10-02: `docker build .` stamps the commit's tag or short commit, not
   `dev` (issue 154). `script/build` writes the version `script/version` prints
   into `dist/package.json`: the `VERSION` environment variable or build arg when

test/examples/download-albums.test.ts

@@ -162,6 +162,9 @@ describe("examples/download-albums.ts", () => {
                 refreshIntervalSeconds: 3600,
                 precacheThumbnails: false,
                 precacheOriginals: false,
+                // The test counts fetches, so the free space of the disk it
+                // runs on must not shrink the cache and evict photo 1.
+                freeBelowBytes: 0,
             });
 
         const first = await open();