Anchorage API reference
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    StreamFrame:
        | { event: ApprovalStreamEvent; type: "queue" }
        | { summary: StreamRunSummary; type: "run" }
        | { roster: PresenceMember[]; type: "presence" }

    The wire union every Durable Object emits: the per-tenant hub fans out queue (an ApprovalStreamEvent) and presence (the roster) frames; the per-run runner DO emits run (the wholesale authoritative RunSummary) frames.