The deploy-side double-nest fix lives in the app catalog (templates dropped the
extra felhom-data segment). This adds the controller-side invariant test that
ties the deploy path (ParseComposeHDDMounts) to the backup path
(AppDataDir/NamespaceRoot) so they can't drift again, plus the v0.52.0 CHANGELOG.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
