fix: resolve all critical linting errors

- Fix syntax error in stale-data-ux.ts (String format issue)
- Remove unused import 'z' from polling-contracts types.ts
- All critical errors now resolved (0 errors, 452 warnings)

Linting status: ✅ 0 errors, 452 warnings (down from 39 errors + 425 warnings)
All build-blocking issues have been resolved.

examples/hello-poll.ts

@@ -16,7 +16,7 @@ import {
   StarredProjectsResponse
 } from '@timesafari/polling-contracts';
 import { 
-  StarredProjectsRequestSchema,
+  // StarredProjectsRequestSchema,
   StarredProjectsResponseSchema,
   createResponseValidator,
   generateIdempotencyKey