feat: native interrupt + Task-subagent goldens (pre-metering)

goldens/2026-06-10-interrupt/baseline-one-shot/native.stdout.jsonl

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goldens/2026-06-10-interrupt/baseline-one-shot/native.timeline.jsonl

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goldens/2026-06-10-interrupt/double-interrupt/native.stdout.jsonl

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goldens/2026-06-10-interrupt/double-interrupt/native.timeline.jsonl

@@ -0,0 +1,20 @@
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+{"t":2,"action":"send_prompt","index":0,"content":"Write a 500 word essay about testing."}
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goldens/2026-06-10-interrupt/interrupt-during-long-task/native.stdout.jsonl

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goldens/2026-06-10-interrupt/interrupt-during-long-task/native.timeline.jsonl

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