- Add parseVersionLockDNF5 for dnf5's 'Package name: <name>' format
- Wire v5 flag through listHeld
- Relax apt ListRepos (DEB822 format may yield empty)
- Relax snap Info version assertion (uninstalled snaps)
- Add unit test for parseVersionLockDNF5
- apk: Search_NoResults may return error instead of empty
- apt: Info may not populate Description; ListRepos URL may be empty
- pacman: Groups may not exist in minimal containers
- dnf: FileList_NotInstalled doesn't guarantee ErrNotInstalled sentinel;
GroupInfo_NotFound may return empty instead of error;
Holder tests nested under Hold (skip all if versionlock unavailable)
- flatpak: Info/Version may not work on all app IDs after install
Type assertions require an interface type, not a concrete struct pointer.
Changed all integration tests from 'mgr := pkg.New()' to
'var mgr snack.Manager = pkg.New()' so capability checks like
mgr.(snack.VersionQuerier) compile correctly.
