Accept a version argument only if the secret has that version (closes #67)

version rm, version promote and get --version joined the version
argument into a path unchecked, so "", ".", "..", "../../.." removed or
read every version, the secret, the vault or directories above it.

A version is now accepted only if it is one of the versions
ListVersions lists for the secret, compared by name before any path is
built (secret.VersionExists, used by all three). An empty --version is
rejected instead of meaning the current version: GetSecretVersion no
longer treats "" as current, and GetSecret looks the current version
up itself.

Model: opus-5-5

internal/cli/secrets.go

@@ -109,6 +109,12 @@ func newGetCmd() *cobra.Command {
 				return fmt.Errorf("failed to initialize CLI: %w", err)
 			}
 
+			// Without --version, get the current version. A given
+			// --version is checked as typed, so an empty one is rejected.
+			if !cmd.Flags().Changed("version") {
+				return cli.GetSecret(cmd, args[0])
+			}
+
 			return cli.GetSecretWithVersion(cmd, args[0], version)
 		},
 	}
@@ -393,12 +399,32 @@ func (cli *Instance) AddSecret(secretName string, force bool) error {
 	return nil
 }
 
-// GetSecret retrieves and prints a secret from the current vault
+// GetSecret retrieves and prints the current version of a secret
 func (cli *Instance) GetSecret(cmd *cobra.Command, secretName string) error {
-	return cli.GetSecretWithVersion(cmd, secretName, "")
+	secret.Debug("GetSecret called", "secretName", secretName)
+
+	// Store the command for output
+	cli.cmd = cmd
+
+	// Get current vault
+	vlt, err := vault.GetCurrentVault(cli.fs, cli.stateDir)
+	if err != nil {
+		return err
+	}
+
+	value, err := vlt.GetSecret(secretName)
+	if err != nil {
+		return err
+	}
+
+	// Print the secret value to stdout
+	_, _ = cli.Print(string(value))
+
+	return nil
 }
 
-// GetSecretWithVersion retrieves and prints a specific version of a secret
+// GetSecretWithVersion retrieves and prints a specific version of a secret.
+// The version must be one of the secret's versions.
 func (cli *Instance) GetSecretWithVersion(
 	cmd *cobra.Command, secretName string, version string,
 ) error {
@@ -417,13 +443,7 @@ func (cli *Instance) GetSecretWithVersion(
 	}
 
 	// Get the secret value
-	var value []byte
-	if version == "" {
-		value, err = vlt.GetSecret(secretName)
-	} else {
-		value, err = vlt.GetSecretVersion(secretName, version)
-	}
-
+	value, err := vlt.GetSecretVersion(secretName, version)
 	if err != nil {
 		secret.Debug("Failed to get secret", "error", err)