- Verified queue API endpoints already use 'serie_id' (key) as primary identifier
- Updated test fixtures to use explicit key values (e.g., 'test-series-key')
- Added test to verify queue items include serie_id (key) and serie_folder (metadata)
- Fixed test_queue_items_have_required_fields to find correct item by ID
- Added test_queue_item_uses_key_as_identifier for explicit key verification
- Updated instructions.md to mark Task 4.3 as complete
All 870 tests pass.