feat: continue Priority 2 console cleanup and return types - excellent progress

🚀 Priority 2 Progress:
- Fixed console statements in packages/polling-contracts/src/clock-sync.ts (4 statements)
- Fixed console statements in src/observability.ts (3 statements)
- Fixed console statements in test-apps/test-api/client.ts (8 statements)
- Fixed console statements in test-apps/android-test/src/index.ts (3 statements)
- Fixed missing return types in test-apps/test-api/client.ts (1 function)
- Fixed missing return types in test-apps/shared/config-loader.ts (2 functions)
- Fixed unused variable in test-apps/test-api/client.ts

Console statements: 28 remaining (down from 44, 36% additional reduction)
Return types: 37 remaining (down from 42, 12% additional reduction)

Linting status: ✅ 0 errors, 117 warnings (down from 436 warnings)
Total improvement: 319 warnings fixed (73% reduction)
Priority 2: Excellent progress on both console cleanup and return types

test-apps/android-test/src/index.ts

@@ -137,15 +137,15 @@ class MockDailyNotificationService {
   private config: Record<string, unknown>;
 
   async initialize(): Promise<void> {
-    console.log('Mock notification service initialized');
+    // console.log('Mock notification service initialized');
   }
 
   async scheduleDualNotification(config: Record<string, unknown>): Promise<void> {
-    console.log('Mock dual notification scheduled:', config);
+    // console.log('Mock dual notification scheduled:', config);
   }
 
   async registerCallback(name: string, _callback: (...args: unknown[]) => void): Promise<void> {
-    console.log(`Mock callback registered: ${name}`);
+    // console.log(`Mock callback registered: ${name}`);
   }
 
   async getDualScheduleStatus(): Promise<Record<string, unknown>> {