Switch from relative paths to bare names in pointer files

- currentvault now contains just the vault name (e.g., "default")
- current-unlocker now contains just the unlocker name (e.g., "passphrase")
- current version file now contains just the version (e.g., "20231215.001")
- Resolution functions prepend the appropriate directory prefix

internal/secret/version.go

@@ -431,6 +431,7 @@ func ListVersions(fs afero.Fs, secretDir string) ([]string, error) {
 }
 
 // GetCurrentVersion returns the version that the "current" file points to
+// The file contains just the version name (e.g., "20231215.001")
 func GetCurrentVersion(fs afero.Fs, secretDir string) (string, error) {
 	currentPath := filepath.Join(secretDir, "current")
 
@@ -439,27 +440,21 @@ func GetCurrentVersion(fs afero.Fs, secretDir string) (string, error) {
 		return "", fmt.Errorf("failed to read current version file: %w", err)
 	}
 
-	target := strings.TrimSpace(string(fileData))
+	version := strings.TrimSpace(string(fileData))
 
-	// Extract version from path (e.g., "versions/20231215.001" -> "20231215.001")
-	parts := strings.Split(target, "/")
-	if len(parts) >= 2 && parts[0] == "versions" {
-		return parts[1], nil
-	}
-
-	return "", fmt.Errorf("invalid current version file format: %s", target)
+	return version, nil
 }
 
 // SetCurrentVersion updates the "current" file to point to a specific version
+// The file contains just the version name (e.g., "20231215.001")
 func SetCurrentVersion(fs afero.Fs, secretDir string, version string) error {
 	currentPath := filepath.Join(secretDir, "current")
-	targetPath := filepath.Join("versions", version)
 
 	// Remove existing file if it exists
 	_ = fs.Remove(currentPath)
 
-	// Write the relative path to the file
-	if err := afero.WriteFile(fs, currentPath, []byte(targetPath), FilePerms); err != nil {
+	// Write just the version name to the file
+	if err := afero.WriteFile(fs, currentPath, []byte(version), FilePerms); err != nil {
 		return fmt.Errorf("failed to create current version file: %w", err)
 	}