Fix missing imports in sync-openai-agents template

Add StreamTaskMessageFull and TextContent imports to acp.py.j2
so the no-API-key error response compiles correctly.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: muhammad-rifky-scale

src/agentex/lib/cli/templates/sync-openai-agents/project/acp.py.j2

@@ -9,8 +9,9 @@ from agentex.lib.core.tracing.tracing_processor_manager import add_tracing_proce
 from agentex.lib.types.tracing import SGPTracingProcessorConfig
 from agentex.lib.utils.model_utils import BaseModel
 
-from agentex.types.task_message_update import TaskMessageUpdate
+from agentex.types.task_message_update import TaskMessageUpdate, StreamTaskMessageFull
 from agentex.types.task_message_content import TaskMessageContent
+from agentex.types.text_content import TextContent
 from agentex.lib.utils.logging import make_logger
 from agents import Agent, Runner, RunConfig, function_tool