fix(tests): repair test_streaming_model so all 28 tests run and pass … #1425

Job	Run time
find-tutorials	5s
test-00_sync/030_langgraph	3m 12s
test-00_sync/010_multiturn	2m 34s
test-00_sync/020_streaming	2m 37s
test-00_sync/000_hello_acp	2m 1s
test-10_async/00_base/010_multiturn	2m 0s
test-10_async/00_base/040_other_sdks	3m 52s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	3m 7s
test-10_async/10_temporal/010_agent_chat	3m 44s
test-10_async/00_base/030_tracing	1m 58s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	3m 7s
test-10_async/00_base/020_streaming	2m 7s
test-10_async/10_temporal/000_hello_acp	2m 2s
test-10_async/10_temporal/050_agent_chat_guardrails	1m 58s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	2m 30s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 8s
test-10_async/10_temporal/030_custom_activities	2m 6s
test-10_async/00_base/100_langgraph	2m 7s
test-10_async/00_base/000_hello_acp	2m 0s
test-10_async/00_base/080_batch_events	3m 4s
test-10_async/10_temporal/020_state_machine	2m 23s
Test Summary	3s
	50m 45s

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