The album id is the server id, so use it for the download, the local folder and the prune fixture instead of maintaining a separate remoteId mapping. The cache key moves to v3 because v2 may already hold folders named after the old local ids.
demo.subsonic.org no longer accepts the guest1 account, so the harness downloaded an XML error page and unzip failed before Gradle ran. Download the same three albums from demo.navidrome.org with the demo account, fetch each album's cover art into folder.jpg, and match the album title the files actually carry (Retroconnaissance, without the EP suffix). Bump the music cache key so stale copies from the old source are not reused.
Trim the explanatory comments to short quirk notes, drop the module headers, and fail cleanly: navidrome/gonic now kill their process if they never become ready and the entrypoint always tears down. The prune test waits for the removal to appear in the album list rather than for the scan flag. Correct the AGENTS token-auth note (lms answers 42, Nextcloud 41) and give CI more headroom.
tools/integration-test.nu is now just the entrypoint. The server lifecycle and fixture preparation live in tools/integration/servers.nu, the Subsonic request helpers in subsonic.nu, and shared waiting/port helpers in util.nu. No behaviour change; the assertions still live in the Kotlin tests.
austinried