- Updated Fetch API to support v0-v11 (was v0-v1)
- Fixed ListOffsets v2 request parsing (added replica_id and isolation_level fields)
- Added proper debug logging for Fetch and ListOffsets handlers
- Improved record batch construction with proper varint encoding
- Cross-client Produce compatibility confirmed (kafka-go and Sarama)
Next: Fix Fetch v5 response format for Sarama consumer compatibility