Clean up legacy code after unified architecture implementation

- Remove obsolete cmd/auto_enhance.go command (replaced by unified enhance)
- Implement EnhanceInPlace method using unified pipeline
- Remove generated demo files from git tracking
- Verify all functionality works after cleanup:
  * go build successful
  * enhance command working correctly
  * unified pipeline (discovery → ID generation → content injection) verified
  * clean command structure (only enhance, serve, restore commands)

The codebase is now clean with no legacy auto-enhance references or stub implementations. All functionality consolidated into the unified Discoverer + Enhancer architecture.

cmd/auto_enhance.go

@@ -1,91 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/insertr/insertr/internal/content"
-	"github.com/spf13/cobra"
-)
-
-var (
-	autoEnhanceOutput     string
-	autoEnhanceAggressive bool
-)
-
-var autoEnhanceCmd = &cobra.Command{
-	Use:   "auto-enhance [input-dir]",
-	Short: "Automatically detect and add insertr classes to HTML elements",
-	Long: `Auto-enhance scans HTML files and automatically adds insertr classes to viable content elements.
-
-This command uses intelligent heuristics to detect editable content:
-- Text-only elements (headers, paragraphs, simple links)
-- Elements with safe inline formatting (strong, em, span, etc.)  
-- Container elements that benefit from expansion
-- Buttons and other interactive content elements
-
-Examples:
-  insertr auto-enhance ./site --output ./enhanced
-  insertr auto-enhance ./blog --output ./blog-enhanced --aggressive
-  insertr auto-enhance /path/to/site --output /path/to/enhanced`,
-	Args: cobra.ExactArgs(1),
-	RunE: runAutoEnhance,
-}
-
-func runAutoEnhance(cmd *cobra.Command, args []string) error {
-	inputDir := args[0]
-
-	// Validate input directory
-	if _, err := os.Stat(inputDir); os.IsNotExist(err) {
-		return fmt.Errorf("input directory does not exist: %s", inputDir)
-	}
-
-	// Default output directory if not specified
-	if autoEnhanceOutput == "" {
-		autoEnhanceOutput = inputDir + "-enhanced"
-	}
-
-	fmt.Printf("🔍 Auto-enhancing HTML files...\n")
-	fmt.Printf("📁 Input: %s\n", inputDir)
-	fmt.Printf("📁 Output: %s\n", autoEnhanceOutput)
-	if autoEnhanceAggressive {
-		fmt.Printf("⚡ Aggressive mode: enabled\n")
-	}
-	fmt.Printf("\n")
-
-	// Create discoverer
-	discoverer := content.NewDiscoverer()
-
-	// Run element discovery
-	result, err := discoverer.DiscoverDirectory(inputDir, autoEnhanceOutput, autoEnhanceAggressive)
-	if err != nil {
-		return fmt.Errorf("auto-enhancement failed: %w", err)
-	}
-
-	// Print results
-	fmt.Printf("✅ Auto-enhancement complete!\n\n")
-	fmt.Printf("📊 Results:\n")
-	fmt.Printf("   Files processed: %d\n", result.FilesProcessed)
-	fmt.Printf("   Elements enhanced: %d\n", result.ElementsEnhanced)
-	fmt.Printf("   Containers added: %d\n", result.ContainersAdded)
-	fmt.Printf("   Individual elements: %d\n", result.IndividualsAdded)
-
-	if len(result.SkippedFiles) > 0 {
-		fmt.Printf("\n⚠️  Skipped files (%d):\n", len(result.SkippedFiles))
-		for _, file := range result.SkippedFiles {
-			fmt.Printf("   - %s\n", file)
-		}
-	}
-
-	fmt.Printf("\n🎯 Enhanced files ready in: %s\n", autoEnhanceOutput)
-	fmt.Printf("📝 Use 'insertr enhance %s' to inject content from database\n", autoEnhanceOutput)
-
-	return nil
-}
-
-func init() {
-	autoEnhanceCmd.Flags().StringVarP(&autoEnhanceOutput, "output", "o", "", "output directory for enhanced files")
-	autoEnhanceCmd.Flags().BoolVar(&autoEnhanceAggressive, "aggressive", false, "aggressive mode: enhance single-child containers")
-
-	rootCmd.AddCommand(autoEnhanceCmd)
-}