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ACP v2 turn-state notification, sent only to the connection that issued the prompt. idle ends the turn; its stopReason is the one the prompt result would carry on v1.

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Properties

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ContentBlock | ContentBlock[]
Type: ContentBlockContentBlockA single block on v1 chunks; a block array on v2 whole-message upserts.
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string
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"state_update"
required
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TurnState
required
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string
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StopReason
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string
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string