Review (iris/argus): the dashboard rebuild live-log header labels one
specific node's log stream (liveNode, keyed by its build_log_id), so it
should show that node's own agent — entryAgents(running) listed every
agent in the DAG, which would mislabel a single agent's log once DAGs
span multiple. The other entryAgents() sites (row label, cancel-confirm,
fingerprint) are correct whole-DAG summaries and unchanged.
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