You'll notice
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When a subagent finishes, its artifact watch is re-armed for the launching session and reported as publish_adopted.
A subagent watching a published artifact can now surface a publish_adopted live-subscription state: when the subagent holds no watch on the artifact but the launching session will take over notifications once the subagent finishes, the handoff re-arms the subscription for the parent session and emits subagent_publish_adopted telemetry. This is wired to fire on subagent completion and is consumed by the artifact tool's status text.