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/vault/management.go

@@ -33,7 +33,7 @@ func isValidVaultName(name string) bool {
 }
 
 // ResolveVaultSymlink reads the currentvault file to get the path to the current vault
-// The file contains a relative path to the vault directory
+// The file contains just the vault name (e.g., "default")
 func ResolveVaultSymlink(fs afero.Fs, currentVaultPath string) (string, error) {
 	secret.Debug("resolveVaultSymlink starting", "path", currentVaultPath)
 
@@ -44,13 +44,13 @@ func ResolveVaultSymlink(fs afero.Fs, currentVaultPath string) (string, error) {
 		return "", fmt.Errorf("failed to read currentvault file: %w", err)
 	}
 
-	// The file contains a relative path like "vaults.d/default"
-	relativePath := strings.TrimSpace(string(fileData))
-	secret.Debug("Read relative path from file", "relative_path", relativePath)
+	// The file contains just the vault name like "default"
+	vaultName := strings.TrimSpace(string(fileData))
+	secret.Debug("Read vault name from file", "vault_name", vaultName)
 
-	// Resolve to absolute path relative to the state directory
+	// Resolve to absolute path: stateDir/vaults.d/vaultName
 	stateDir := filepath.Dir(currentVaultPath)
-	absolutePath := filepath.Join(stateDir, relativePath)
+	absolutePath := filepath.Join(stateDir, "vaults.d", vaultName)
 
 	secret.Debug("Resolved to absolute path", "absolute_path", absolutePath)
 
@@ -256,9 +256,8 @@ func SelectVault(fs afero.Fs, stateDir string, name string) error {
 		return fmt.Errorf("vault %s does not exist", name)
 	}
 
-	// Create or update the currentvault file with the relative path
+	// Create or update the currentvault file with just the vault name
 	currentVaultPath := filepath.Join(stateDir, "currentvault")
-	relativePath := filepath.Join("vaults.d", name)
 
 	// Remove existing file if it exists
 	if _, err := fs.Stat(currentVaultPath); err == nil {
@@ -266,9 +265,9 @@ func SelectVault(fs afero.Fs, stateDir string, name string) error {
 		_ = fs.Remove(currentVaultPath)
 	}
 
-	// Write the relative path to the file
-	secret.Debug("Writing currentvault file", "relative_path", relativePath)
-	if err := afero.WriteFile(fs, currentVaultPath, []byte(relativePath), secret.FilePerms); err != nil {
+	// Write just the vault name to the file
+	secret.Debug("Writing currentvault file", "vault_name", name)
+	if err := afero.WriteFile(fs, currentVaultPath, []byte(name), secret.FilePerms); err != nil {
 		return fmt.Errorf("failed to select vault: %w", err)
 	}