feat(testing): update test apps with generic polling and add CI/CD pipeline

- Update iOS and Android test apps with generic polling interface support
- Add testGenericPolling(), testPollingSchedule(), and testPollingResults() methods
- Include comprehensive testing of GenericPollingRequest creation and validation
- Add PollingScheduleConfig testing with cron expressions and platform adapters
- Test PollingResult handling with watermark CAS and acknowledgment flows
- Update test-apps/README.md with generic polling testing capabilities
- Add .github/workflows/ci.yml with automated testing pipeline
- Include linting, unit tests (workspaces), and k6 smoke test execution
- Add k6/poll-ack-smoke.js for fault-injection testing of poll and ack endpoints
- Support cross-platform testing with consistent TypeScript interfaces
- Include platform-specific optimizations (WorkManager, BGTaskScheduler, Service Workers)

Provides comprehensive testing infrastructure for the generic polling system.

.github/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  test-and-smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with: { node-version: 20 }
+      - run: npm ci
+      - run: npm run lint
+      - run: npm test --workspaces
+      - name: k6 smoke (poll+ack)
+        uses: grafana/k6-action@v0.3.1
+        with:
+          filename: k6/poll-ack-smoke.js
+        env:
+          API: ${{ secrets.SMOKE_API }}
+          JWT: ${{ secrets.SMOKE_JWT }}