# 13. Implement Android feed fetcher service

meta:
  id: native-business-logic-migration-13
  feature: native-business-logic-migration
  priority: P0
  depends_on: [native-business-logic-migration-10]
  tags: [implementation, android, networking]

objective:
- Implement feed fetching service with OkHttp

deliverables:
- FeedFetcher.kt
- HTTPAuthCredentials.kt
- FetchResult.kt
- NetworkError.kt
- Feed caching implementation

tests:
- Unit: Test OkHttp configuration
- Unit: Test HTTP auth handling
- Unit: Test error cases (timeout, 404, etc.)
- Integration: Test fetching real feeds

acceptance_criteria:
- Feeds fetch with proper timeout (15s)
- HTTP auth supported
- Error handling complete
- Response caching implemented
- Performance: <5s for typical feed

validation:
- Run `./gradlew test`
- Test with network throttling

notes:
- Use OkHttp with proper configuration
- Implement exponential backoff for retries
- Respect Cache-Control headers
