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/shared/config-loader.ts

@@ -334,7 +334,7 @@ export class ConfigLoader {
   /**
    * Get notification types for a specific category
    */
-  public getNotificationTypes(category: keyof TimeSafariConfig['notificationTypes']) {
+  public getNotificationTypes(category: keyof TimeSafariConfig['notificationTypes']): Record<string, unknown> {
     const config = this.getConfig();
     return config.notificationTypes[category];
   }
@@ -367,7 +367,7 @@ export class TestLogger {
     }
   }
 
-  public debug(message: string, data?: Record<string, unknown>) {
+  public debug(message: string, data?: Record<string, unknown>): void {
     if (this.shouldLog('debug')) {
       console.log(`[DEBUG] ${message}`, data || '');
       this.addToLogs('debug', message, data);