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Surfaced preparing the live USB validation on demo-felhom: - observe.go: an unmounted removable dir-storage no longer falls through to the ROOT fs for its backing device/UUID — durable_id was becoming uuid:<root-uuid> (a DR mis-id that would re-attach the wrong disk). Now derived only from the target's own mountpoint; unmounted → no device + stable store:<name> durable_id. Removed containingMountDevice. - watchdog.go: remember the fs-UUID observed while attached and backfill it onto the re-mount target, so re-mount works even if the known-set cache refreshed mid-drop (doc 03 §7 "sourced from the existing definition"). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>