When the local index is bound to a different destination than the
configured one, snapshot list now gives the warning prune, snapshot
purge and snapshot remove refuse with: both destinations and the two
ways out (revert the configuration, or run vaultik database delete).
Below the table it replaces the local-only note and its prune advice.
With --json it goes to stderr through the logger, so stdout stays the
document, whose local rows show remote_present false.
Reading the binding moves out of EnsureStorageBinding into
storageBinding, which records nothing, so the read-only list can call
it without binding a fresh index.
Model: opus-5-5
sneak