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## What changed Add the disabled-by-default `guardian_root_handoff_context` feature to select worker-specific root evidence for Guardian reviews. Use recorded `spawn_agent`, `send_message`, and `followup_task` calls targeting a worker or its ancestors to select the three preceding root messages per handoff, plus the three latest root messages so recent cancellations remain visible before another handoff. Preserve verified tool answers and evidence without known ordering, and retain the existing shared message cap. Fall back to the existing root context when no usable handoff window remains or the latest authorization message is a heartbeat. Update the review context revision when the selection changes. ## Testing Add a delegation scenario and Guardian request snapshot covering ancestor handoffs, separate worker branches, cancellation visibility, and fallback after compaction removes handoff calls. Extend heartbeat coverage to exercise the new feature and verify that the latest turn's trusted skills are retained. GitOrigin-RevId: 87dc39158f78b2b7e9f4f2e4afc653257ea12025