feat(ai): add ADR-036 unified OCR architecture and frontend test coverage

- Add ADR-036 unified OCR architecture (typhoon-ocr via Ollama)
- Extend AI execution profiles for OCR sandbox configuration
- Add comprehensive frontend test coverage (components, hooks, services)
- Add backend test coverage for document-numbering services
- Update OCR sidecar with typhoon-ocr integration
- Add AI policy service and execution profile management
- Update AGENTS.md and architecture documentation

backend/src/modules/document-numbering/document-numbering.service.spec.ts

@@ -156,6 +156,17 @@ describe('DocumentNumberingService', () => {
         'Transaction failed'
       );
     });
+
+    it('should throw error when format fails', async () => {
+      (counterService.incrementCounter as jest.Mock).mockResolvedValue(1);
+      (formatService.format as jest.Mock).mockRejectedValue(
+        new Error('Format failed')
+      );
+
+      await expect(service.generateNextNumber(mockContext)).rejects.toThrow(
+        'Format failed'
+      );
+    });
   });
 
   describe('Admin Operations', () => {