fix: resolve all nlreturn linter errors

Add blank lines before return statements in all files to satisfy
the nlreturn linter. This improves code readability by providing
visual separation before return statements.

Changes made across 24 files:
- internal/cli/*.go
- internal/secret/*.go
- internal/vault/*.go
- pkg/agehd/agehd.go
- pkg/bip85/bip85.go

All 143 nlreturn issues have been resolved.

internal/cli/version.go

@@ -19,6 +19,7 @@ const (
 // newVersionCmd returns the version management command
 func newVersionCmd() *cobra.Command {
 	cli := NewCLIInstance()
+
 	return VersionCommands(cli)
 }
 
@@ -64,12 +65,14 @@ func (cli *Instance) ListVersions(cmd *cobra.Command, secretName string) error {
 	vlt, err := vault.GetCurrentVault(cli.fs, cli.stateDir)
 	if err != nil {
 		secret.Debug("Failed to get current vault", "error", err)
+
 		return err
 	}
 
 	vaultDir, err := vlt.GetDirectory()
 	if err != nil {
 		secret.Debug("Failed to get vault directory", "error", err)
+
 		return err
 	}
 
@@ -81,10 +84,12 @@ func (cli *Instance) ListVersions(cmd *cobra.Command, secretName string) error {
 	exists, err := afero.DirExists(cli.fs, secretDir)
 	if err != nil {
 		secret.Debug("Failed to check if secret exists", "error", err)
+
 		return fmt.Errorf("failed to check if secret exists: %w", err)
 	}
 	if !exists {
 		secret.Debug("Secret not found", "secret_name", secretName)
+
 		return fmt.Errorf("secret '%s' not found", secretName)
 	}
 
@@ -92,11 +97,13 @@ func (cli *Instance) ListVersions(cmd *cobra.Command, secretName string) error {
 	versions, err := secret.ListVersions(cli.fs, secretDir)
 	if err != nil {
 		secret.Debug("Failed to list versions", "error", err)
+
 		return fmt.Errorf("failed to list versions: %w", err)
 	}
 
 	if len(versions) == 0 {
 		cmd.Println("No versions found")
+
 		return nil
 	}