✅ FIXED: JoinGroup request parsing error that was causing error responses
- Fixed test data: group ID 'debug-group' is 11 bytes, not 10
- JoinGroup now parses correctly and returns valid responses
- Manual JoinGroup test shows perfect parsing (200 bytes response)
❌ REMAINING ISSUE: kafka-go still restarts consumer group workflow
- JoinGroup response is syntactically correct but semantically rejected
- kafka-go closes connection immediately after JoinGroup response
- No SyncGroup calls - suggests response content issue
Next: Investigate JoinGroup response content compatibility with kafka-go
