feat(openai-agents): single-emit + input-bearing tool spans + run_turn (#445)

Author: declan-scale

src/agentex/lib/core/temporal/plugins/openai_agents/__init__.py

@@ -51,6 +51,10 @@
 - No forked plugin required - uses standard OpenAIAgentsPlugin
 """
 
+from agentex.lib.core.temporal.plugins.openai_agents.run import (
+    OpenAIAgentsTurnResult,
+    run_turn,
+)
 from agentex.lib.core.temporal.plugins.openai_agents.hooks.hooks import (
     TemporalStreamingHooks,
 )
@@ -81,4 +85,6 @@
     "streaming_parent_span_id",
     "TemporalStreamingHooks",
     "stream_lifecycle_content",
-]
+    "run_turn",
+    "OpenAIAgentsTurnResult",
+]