The init-generated config now ships with a comprehensive home snapshot
exclude list (caches, trash, cloud-synced data, rebuildable app state,
device backups) derived from a battle-tested rsync backup script, plus
an apps snapshot for /Applications excluding Apple-redownloadable apps
(Safari, GarageBand, iWork, iMovie) and large third-party installs.
Obsolete pre-Catalina app entries (Dashboard, iTunes, DVD Player, etc.)
were dropped — OS apps live in /System/Applications on modern macOS and
never appear in /Applications.
Adds a test asserting the template parses as valid YAML with the
expected snapshot structure.
