perf(tracing): bounded-concurrency span export #1586

Job	Run time
find-tutorials	6s
test-10_async/00_base/040_other_sdks	3m 41s
test-10_async/00_base/000_hello_acp	3m 14s
test-00_sync/000_hello_acp	3m 8s
test-00_sync/030_langgraph	3m 15s
test-00_sync/020_streaming	3m 0s
test-10_async/10_temporal/080_open_ai_agents_sdk_human_in_the_loop	2m 55s
test-10_async/00_base/080_batch_events	3m 7s
test-10_async/00_base/110_pydantic_ai	3m 36s
test-10_async/00_base/030_tracing	3m 24s
test-10_async/10_temporal/030_custom_activities	3m 36s
test-00_sync/040_pydantic_ai	3m 44s
test-10_async/10_temporal/020_state_machine	3m 26s
test-10_async/00_base/010_multiturn	3m 48s
test-10_async/10_temporal/010_agent_chat	3m 31s
test-10_async/10_temporal/000_hello_acp	2m 53s
test-10_async/00_base/020_streaming	3m 33s
test-10_async/10_temporal/110_pydantic_ai	3m 57s
test-00_sync/010_multiturn	3m 26s
test-10_async/10_temporal/070_open_ai_agents_sdk_tools	3m 33s
test-10_async/10_temporal/050_agent_chat_guardrails	3m 41s
test-10_async/10_temporal/090_claude_agents_sdk_mvp	3m 35s
test-10_async/00_base/100_langgraph	3m 18s
test-10_async/10_temporal/060_open_ai_agents_sdk_hello_world	3m 37s
Test Summary	4s
	1h 19m 8s

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