feat: harden A2A funnel and paid proposal intake

packages/agent-sdk-python/test_python_sdk.py

@@ -2,9 +2,13 @@ import os
 from vibework_agent_sdk import VibeWorkAgentSDK
 from vibework_agent_sdk.models import AgentCard
 
+api_key = (os.getenv("MCP_API_KEY") or os.getenv("API_KEY") or "").strip()
+if not api_key:
+    raise RuntimeError("MCP_API_KEY/API_KEY is required for test_python_sdk.py")
+
 sdk = VibeWorkAgentSDK(
     base_url="https://agent.wooo.work",
-    api_key="super-secret-mcp-key"
+    api_key=api_key,
 )
 
 agent_id = "test-hunter-bot-py-001"