/close #53 /claim #53

The fix involved:

Updating the API endpoint from /v1/responses to /v1/chat/completions Updating the request/response structures to match the Chat Completions API Fixing message conversion for multi-turn conversations Adding proper streaming support The tests confirm that:

✅ Message structure is correct for multi-turn conversations ✅ Request creation works properly ✅ Tool results are handled correctly ✅ Finish reason conversion works ✅ The fix addresses the root cause of the 400 error