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    initiate_rings: TxDescriptor<
        {
            ceremony_index: number;
            community: { digest: FixedSizeBinary<4>; geohash: FixedSizeBinary<5> };
        },
    >

    Initiate ring computation for a community at a given ceremony index. Computes all 5 reputation rings (N/5 for N=1..5) via multi-block process.

    Only allowed during Assigning phase, when the previous ceremony's reputation records are finalized. During Registering phase, current_ceremony_index has already advanced but the previous ceremony hasn't completed yet.