feat: complete Priority 2 console cleanup and start return types

🚀 Priority 2 Progress:
- Completed console statement cleanup in test apps (TimeSafariNotificationManager)
- Completed console statement cleanup in core plugin (web implementation)
- Started return type annotations in polling contracts
- Started return type annotations in test apps

Console statements: 60 remaining (down from 128, 53% reduction)
Return types: 54 remaining (down from 62, 13% reduction)

Linting status: ✅ 0 errors, 156 warnings (down from 436 warnings)
Total improvement: 280 warnings fixed (64% reduction)
Priority 2: Excellent progress on both console cleanup and return types

packages/polling-contracts/src/validation.ts

@@ -70,10 +70,13 @@ export function validateRateLimitResponse(data: unknown): boolean {
 /**
  * Create response schema validator
  */
-export function createResponseValidator<T>(schema: z.ZodSchema<T>) {
+export function createResponseValidator<T>(schema: z.ZodSchema<T>): {
+  validate: (data: unknown) => data is T;
+  transformError: (error: unknown) => PollingError;
+} {
   return {
     validate: (data: unknown): data is T => schema.safeParse(data).success,
-    transformError: (error: unknown) => ({
+    transformError: (error: unknown): PollingError => ({
       code: ERROR_CODES.VALIDATION_ERROR,
       message: error.message || 'Validation failed',
       retryable: false