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## Why `MultiAgentV2` follow-up messages are delivered to agents as assistant-authored `InterAgentCommunication` envelopes. When `followup_task` used `interrupt: true`, the interrupted-turn guidance was still persisted as a contextual user message, so model-visible history made a system-generated interruption boundary look user-authored. This keeps interruption guidance consistent with the rest of the v2 inter-agent message stream while preserving the legacy marker shape for non-v2 sessions. ## What changed - Make `interrupted_turn_history_marker` feature-aware. - Record the interrupted-turn marker as an assistant `OutputText` message when `Feature::MultiAgentV2` is enabled. - Keep the existing user contextual fragment for non-v2 sessions. - Apply the same feature-aware marker to interrupted fork snapshots. - Add coverage for the live `followup_task` interrupt path and the helper-level v2 marker shape. ## Testing - `cargo test -p codex-core multi_agent_v2_followup_task_interrupts_busy_child_without_losing_message -- --nocapture` - `cargo test -p codex-core multi_agent_v2_interrupted_marker_uses_assistant_output_message -- --nocapture` - `cargo test -p codex-core interrupted_fork_snapshot -- --nocapture`