fix: disable OpenAI tracing to avoid 401 with Azure API keys

The SDK sends traces to api.openai.com by default, which fails
when using Azure API keys.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: John-Lin

bot/agents.py

@@ -12,6 +12,7 @@
 from agents.mcp import MCPServerStreamableHttp
 from agents.models.openai_chatcompletions import OpenAIChatCompletionsModel
 from agents.models.openai_responses import OpenAIResponsesModel
+from agents.tracing import set_tracing_disabled
 from openai import AsyncOpenAI
 
 DEFAULT_INSTRUCTIONS = (
@@ -24,6 +25,8 @@
 MAX_TURNS = 10
 MCP_SESSION_TIMEOUT_SECONDS = 30.0
 
+set_tracing_disabled(True)
+
 
 def _get_model() -> OpenAIResponsesModel | OpenAIChatCompletionsModel:
     """Create an OpenAI model from environment variables.