feat(FN-1354): add auto-summarize task titles feature

- Add /api/ai/summarize-title endpoint for AI-generated task titles
- Integrate title summarization into task creation flow when autoSummarizeTitles is enabled
- Add debug logging and error checking to summarizeTitle in ai-summarize.ts
- Add error logging to route handler and task store for failed summaries
- Add comprehensive integration tests for the summarize-title API endpoint
- Add memory entry documenting the auto-summarize titles bug fix

packages/core/src/store.test.ts

@@ -5823,10 +5823,10 @@ Task with acceptance criteria
 
       expect(task.title).toBeUndefined();
       expect(task.id).toMatch(/^FN-\d+$/); // Task still created
-      expect(consoleSpy).toHaveBeenCalledWith(
-        expect.stringContaining("Title summarization failed"),
-        expect.stringContaining("AI service failed")
-      );
+      expect(consoleSpy.mock.calls[0][0]).toMatch(/Title summarization failed for task/);
+      expect(consoleSpy.mock.calls[0][0]).toMatch(/AI service failed/);
+      expect(consoleSpy.mock.calls[0][0]).toMatch(/desc length: 201/);
+      expect(consoleSpy.mock.calls[0][0]).toMatch(/auto-summarize: true/);
 
       consoleSpy.mockRestore();
     });