feat: implement XML extraction utilities and enhance feature handling

- Introduced a new xml-extractor module with functions for XML parsing, including escaping/unescaping XML characters, extracting sections and elements, and managing implemented features.
- Added functionality to add, remove, update, and check for implemented features in the app_spec.txt file.
- Enhanced the create and update feature handlers to check for duplicate titles and trigger synchronization with app_spec.txt on status changes.
- Updated tests to cover new XML extraction utilities and feature handling logic, ensuring robust functionality and reliability.

apps/server/src/routes/features/routes/create.ts

@@ -23,6 +23,19 @@ export function createCreateHandler(featureLoader: FeatureLoader) {
         return;
       }
 
+      // Check for duplicate title if title is provided
+      if (feature.title && feature.title.trim()) {
+        const duplicate = await featureLoader.findDuplicateTitle(projectPath, feature.title);
+        if (duplicate) {
+          res.status(409).json({
+            success: false,
+            error: `A feature with title "${feature.title}" already exists`,
+            duplicateFeatureId: duplicate.id,
+          });
+          return;
+        }
+      }
+
       const created = await featureLoader.create(projectPath, feature);
       res.json({ success: true, feature: created });
     } catch (error) {

apps/server/src/routes/features/routes/update.ts

@@ -4,8 +4,14 @@
 
 import type { Request, Response } from 'express';
 import { FeatureLoader } from '../../../services/feature-loader.js';
-import type { Feature } from '@automaker/types';
+import type { Feature, FeatureStatus } from '@automaker/types';
 import { getErrorMessage, logError } from '../common.js';
+import { createLogger } from '@automaker/utils';
+
+const logger = createLogger('features/update');
+
+// Statuses that should trigger syncing to app_spec.txt
+const SYNC_TRIGGER_STATUSES: FeatureStatus[] = ['verified', 'completed'];
 
 export function createUpdateHandler(featureLoader: FeatureLoader) {
   return async (req: Request, res: Response): Promise<void> => {
@@ -34,6 +40,28 @@ export function createUpdateHandler(featureLoader: FeatureLoader) {
         return;
       }
 
+      // Check for duplicate title if title is being updated
+      if (updates.title && updates.title.trim()) {
+        const duplicate = await featureLoader.findDuplicateTitle(
+          projectPath,
+          updates.title,
+          featureId // Exclude the current feature from duplicate check
+        );
+        if (duplicate) {
+          res.status(409).json({
+            success: false,
+            error: `A feature with title "${updates.title}" already exists`,
+            duplicateFeatureId: duplicate.id,
+          });
+          return;
+        }
+      }
+
+      // Get the current feature to detect status changes
+      const currentFeature = await featureLoader.get(projectPath, featureId);
+      const previousStatus = currentFeature?.status as FeatureStatus | undefined;
+      const newStatus = updates.status as FeatureStatus | undefined;
+
       const updated = await featureLoader.update(
         projectPath,
         featureId,
@@ -42,6 +70,22 @@ export function createUpdateHandler(featureLoader: FeatureLoader) {
         enhancementMode,
         preEnhancementDescription
       );
+
+      // Trigger sync to app_spec.txt when status changes to verified or completed
+      if (newStatus && SYNC_TRIGGER_STATUSES.includes(newStatus) && previousStatus !== newStatus) {
+        try {
+          const synced = await featureLoader.syncFeatureToAppSpec(projectPath, updated);
+          if (synced) {
+            logger.info(
+              `Synced feature "${updated.title || updated.id}" to app_spec.txt on status change to ${newStatus}`
+            );
+          }
+        } catch (syncError) {
+          // Log the sync error but don't fail the update operation
+          logger.error(`Failed to sync feature to app_spec.txt:`, syncError);
+        }
+      }
+
       res.json({ success: true, feature: updated });
     } catch (error) {
       logError(error, 'Update feature failed');