fix: strip prompts/ prefix from config paths to avoid duplication (#200)

Previously, config paths like 'prompts/coder.md' resulted in destination
.opencode/prompts/prompts/coder.md (duplicated prompts/).

Now the CLI normalizes paths by stripping the leading 'prompts/' prefix
before determining the destination, ensuring the output matches the
config structure.

Also adds validation to fail with a clear error if the normalized
path would be empty (e.g., config just says 'prompts').

Author: sven1103-agent

cmd/bundle.go

@@ -344,24 +344,33 @@ func installPromptFiles(bundleRoot, projectRoot string, promptFiles []string, fo
 	}
 
 	for _, pf := range promptFiles {
+		// Normalize path: strip leading "prompts/" prefix to avoid duplication
+		normalizedPath := strings.TrimPrefix(pf, "prompts/")
+		normalizedPath = strings.TrimPrefix(normalizedPath, "/")
+
+		// Validate normalized path isn't empty
+		if normalizedPath == "" {
+			return nil, fmt.Errorf("invalid prompt path in config: %q - path cannot be empty after normalization", pf)
+		}
+
 		sourcePath := filepath.Join(bundleRoot, pf)
 
 		// Verify source file exists
 		if _, err := os.Stat(sourcePath); err != nil {
 			return nil, fmt.Errorf("prompt file not found in bundle: %s", pf)
 		}
 
-		// Determine destination (preserve relative structure)
-		destPath := filepath.Join(promptsDir, filepath.Base(pf))
+		// Determine destination (preserve relative structure, but strip leading "prompts/" prefix)
+		destPath := filepath.Join(promptsDir, filepath.Base(normalizedPath))
 
-		// Create subdirectory if needed (for paths like prompts/subdir/file.md)
-		if strings.Contains(pf, string(filepath.Separator)) {
-			subdir := filepath.Dir(pf)
+		// Create subdirectory if needed (for paths like subdir/file.md)
+		if strings.Contains(normalizedPath, string(filepath.Separator)) {
+			subdir := filepath.Dir(normalizedPath)
 			subdirPath := filepath.Join(promptsDir, subdir)
 			if err := os.MkdirAll(subdirPath, 0755); err != nil {
 				return nil, fmt.Errorf("failed to create subdirectory: %w", err)
 			}
-			destPath = filepath.Join(promptsDir, pf)
+			destPath = filepath.Join(promptsDir, normalizedPath)
 		}
 
 		// Check if destination exists (unless force)