- Fix type mismatch in search_cache.go: SearchWithCache now returns *yandex.Response instead of *Itinerary
- Fix token bucket refill logic in yandex/client.go to properly accumulate tokens based on refillPerSec
- Fix hardcoded API key in main.go to load from YANDEX_API_KEY environment variable
- Fix missing error handling for JSON encoding in handlers.go RouteGeoJSON function
- Fix incorrect redis.Nil handling in cache/store.go CacheAside.Exists method
- Fix incorrect error return type in station_status.go updateStationStatus to return newStatus instead of empty string
- Create cmd/cron/station_status.go with daily station status checking
- Implement schedule querying via Yandex API with rate limiting and circuit breaker
- Closure detection: N consecutive days of zero trips (N=3) → closed status
- Reactivation: active status when trips resume after being closed
- Add tests for cron logic: status transition, zero-flight detection, reactivation
- All tests pass: go test ./cmd/cron/ and go test ./...
