Qwen Code hardens agent-to-agent IPC: refused messages are reported, held ones expire, ambiguous destinations rejected

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Three IPC changes in v0.23.1-preview.0 tighten peer messaging between agents: senders are now told when a message is refused and held messages expire (PR #10809), the peer inbox reports when it is unreachable rather than silently accepting (PR #10800), and peer messages are held across review classes while repositories may only tighten inbound settings (PR #11026). Separately, core now rejects ambiguous send_message destinations outright (PR #10090). Silent message drops between agents are the hardest multi-agent bug to see; this is the fix shape to copy in your own orchestrator.