fix: Temporal Union deserialization causing tool_response messages to be lost #1231

Job	Run time
find-tutorials	3s
test-10_async/00_base/000_hello_acp	1m 58s
test-00_sync/000_hello_acp	2m 1s
test-10_async/00_base/010_multiturn	2m 3s
test-00_sync/010_multiturn	2m 41s
test-10_async/10_temporal/010_agent_chat	2m 33s
test-10_async/00_base/100_langgraph	2m 8s
test-10_async/00_base/030_tracing	1m 55s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 5s
test-10_async/00_base/020_streaming	2m 3s
test-00_sync/020_streaming	2m 43s
test-10_async/00_base/080_batch_events	2m 58s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 46s
test-10_async/10_temporal/000_hello_acp	2m 11s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	2m 17s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	2m 44s
test-00_sync/030_langgraph	3m 11s
test-10_async/00_base/040_other_sdks	4m 1s
test-10_async/10_temporal/030_custom_activities	2m 1s
test-10_async/10_temporal/020_state_machine	4m 29s
test-10_async/10_temporal/050_agent_chat_guardrails	1m 55s
Test Summary	6s
	50m 52s

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