Consolidate CLI verbs; retire overlapping commands

The verb surface accumulated overlapping cleanup commands. Consolidate
so each cleanup verb has one meaning:

- Rename 'database purge' -> 'database delete'. The command removes the
  SQLite file entirely; "purge" wrongly suggested purging contents.
- Fold 'snapshot cleanup' into 'prune'. Prune now runs three passes:
  reconcile local snapshots against the remote (previously the
  standalone cleanup command), drop orphaned local rows, then delete
  unreferenced remote blobs. One command, one mental model.
- Delete 'store info'. Its output was a strict subset of 'remote info',
  which already prints storage type + location. Any user reaching for
  either should reach for 'remote info'.
- Drop 'snapshot remove --all'. It duplicated 'remote nuke --force'.
  'remote nuke' is the single supported entry point for wiping the
  destination store.

Also update the storage-binding error message to reference the new
'vaultik database delete' name.

internal/vaultik/prune.go

@@ -58,6 +58,14 @@ func (v *Vaultik) Prune(opts *PruneOptions) error {
 	if err := v.EnsureStorageBinding(); err != nil {
 		return err
 	}
+	// First reconcile local snapshot records against remote metadata:
+	// any local snapshot whose manifest is missing from the destination
+	// store is treated as gone. This used to be the separate 'snapshot
+	// cleanup' command and is now folded in so a single 'vaultik prune'
+	// gets the local index fully back in sync with the destination.
+	if err := v.CleanupLocalSnapshots(); err != nil {
+		return fmt.Errorf("reconciling local snapshots with remote: %w", err)
+	}
 	if _, err := v.PruneDatabase(); err != nil {
 		return fmt.Errorf("pruning local database: %w", err)
 	}

internal/vaultik/remove_snapshot_test.go

@@ -291,7 +291,7 @@ func TestRemoveAllSnapshots_RequiresForce(t *testing.T) {
 
 	tv := vaultik.NewForTesting(store)
 
-	opts := &vaultik.RemoveOptions{All: true} // No Force
+	opts := &vaultik.RemoveOptions{} // No Force
 	_, err := tv.RemoveAllSnapshots(opts)
 
 	assert.Error(t, err)
@@ -310,7 +310,7 @@ func TestRemoveAllSnapshots_WithForce(t *testing.T) {
 
 	tv := vaultik.NewForTesting(store)
 
-	opts := &vaultik.RemoveOptions{All: true, Force: true}
+	opts := &vaultik.RemoveOptions{Force: true}
 	result, err := tv.RemoveAllSnapshots(opts)
 
 	require.NoError(t, err)
@@ -342,7 +342,7 @@ func TestRemoveAllSnapshots_DryRun(t *testing.T) {
 	// Default (no LocalOnly) enumerates the orphan remote keys, which
 	// matches what NewForTesting has — local DB is empty, so the two
 	// addManifest calls land as orphan remote keys.
-	opts := &vaultik.RemoveOptions{All: true, Force: true, DryRun: true}
+	opts := &vaultik.RemoveOptions{Force: true, DryRun: true}
 	result, err := tv.RemoveAllSnapshots(opts)
 
 	require.NoError(t, err)
@@ -362,7 +362,7 @@ func TestRemoveAllSnapshots_NoSnapshots(t *testing.T) {
 
 	tv := vaultik.NewForTesting(store)
 
-	opts := &vaultik.RemoveOptions{All: true, Force: true}
+	opts := &vaultik.RemoveOptions{Force: true}
 	result, err := tv.RemoveAllSnapshots(opts)
 
 	require.NoError(t, err)

internal/vaultik/snapshot.go

@@ -987,7 +987,6 @@ type RemoveOptions struct {
 	DryRun    bool
 	JSON      bool
 	LocalOnly bool // Skip remote cleanup; only touch the local index
-	All       bool // Remove all snapshots (requires Force)
 }
 
 // RemoveResult contains the result of a snapshot removal

internal/vaultik/storage_bind.go

@@ -86,6 +86,6 @@ func buildBindingMismatchMessage(stored, configured string) string {
 		"\n" +
 		"To proceed, either:\n" +
 		"  - revert storage_url in your config to the bound destination, or\n" +
-		"  - run 'vaultik database purge' to discard the local index and rebuild it\n" +
+		"  - run 'vaultik database delete' to discard the local index and rebuild it\n" +
 		"    from a fresh full backup against the new destination"
 }

internal/vaultik/storage_bind_test.go

@@ -68,5 +68,5 @@ func TestEnsureStorageBinding_MismatchRefuses(t *testing.T) {
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "file:///mnt/backups/old")
 	assert.Contains(t, err.Error(), "file:///mnt/backups/new")
-	assert.Contains(t, err.Error(), "vaultik database purge")
+	assert.Contains(t, err.Error(), "vaultik database delete")
 }