fix(build): update toolchain configuration and test error handling for stricter TypeScript builds

test/test.document.ts

@@ -41,7 +41,8 @@ tap.test('analyzeDocuments should analyze a PDF', async () => {
     console.log('Document analysis result:', result);
     expect(result).toBeTruthy();
   } catch (error) {
-    console.log('Document test failed (may need puppeteer):', error.message);
+    const message = error instanceof Error ? error.message : String(error);
+    console.log('Document test failed (may need puppeteer):', message);
   } finally {
     await stopSmartpdf();
   }