Fix integration tests: correct vault derivation index and debug test failures

internal/cli/unlockers.go

@@ -240,13 +240,8 @@ func (cli *CLIInstance) UnlockersAdd(unlockerType string, cmd *cobra.Command) er
 			return fmt.Errorf("failed to get current vault: %w", err)
 		}
 
-		// Try to unlock the vault if not already unlocked
-		if vlt.Locked() {
-			_, err := vlt.UnlockVault()
-			if err != nil {
-				return fmt.Errorf("failed to unlock vault: %w", err)
-			}
-		}
+		// For passphrase unlockers, we don't need the vault to be unlocked
+		// The CreatePassphraseUnlocker method will handle getting the long-term key
 
 		// Check if passphrase is set in environment variable
 		var passphraseStr string