fix: import missing RPC response types in agents resource

The custom create_task/cancel_task/send_message/send_event helpers
reference CreateTaskResponse, CancelTaskResponse, SendMessageResponse,
SendMessageStreamResponse, and SendEventResponse but only AgentRpcResponse
was imported, causing NameError at runtime.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: declan-scale

src/agentex/resources/agents/agents.py

@@ -38,7 +38,14 @@
 )
 from ...types.agent import Agent
 from ..._base_client import make_request_options
-from ...types.agent_rpc_response import AgentRpcResponse
+from ...types.agent_rpc_response import (
+    AgentRpcResponse,
+    CancelTaskResponse,
+    CreateTaskResponse,
+    SendEventResponse,
+    SendMessageResponse,
+    SendMessageStreamResponse,
+)
 from ...types.agent_list_response import AgentListResponse
 from ...types.shared.delete_response import DeleteResponse
 

src/agentex/types/agent_rpc_response.py

@@ -11,7 +11,14 @@
 from .agent_rpc_result import AgentRpcResult
 from .task_message_update import TaskMessageUpdate
 
-__all__ = ["AgentRpcResponse"]
+__all__ = [
+    "AgentRpcResponse",
+    "CancelTaskResponse",
+    "CreateTaskResponse",
+    "SendEventResponse",
+    "SendMessageResponse",
+    "SendMessageStreamResponse",
+]
 
 
 class BaseAgentRpcResponse(BaseModel):