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.

internal/api/handlers.go

@@ -342,8 +342,15 @@ func (h *ContentHandler) CreateContent(w http.ResponseWriter, r *http.Request) {
 	item := h.convertToAPIContent(content)
 
 	// Trigger file enhancement if site is registered for auto-enhancement
-	if h.siteManager != nil && h.siteManager.IsAutoEnhanceEnabled(siteID) {
+	log.Printf("🔍 Checking auto-enhancement for site: %s", siteID)
+	if h.siteManager == nil {
+		log.Printf("❌ No site manager configured")
+	} else if !h.siteManager.IsAutoEnhanceEnabled(siteID) {
+		log.Printf("❌ Auto-enhancement not enabled for site: %s", siteID)
+	} else {
+		log.Printf("✅ Triggering auto-enhancement for site: %s", siteID)
 		go func() {
+			log.Printf("🔄 Starting enhancement for site: %s", siteID)
 			if err := h.siteManager.EnhanceSite(siteID); err != nil {
 				log.Printf("⚠️ Failed to enhance site %s: %v", siteID, err)
 			} else {