Prometheus Entity Management API
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    GraphMutation:
        | {
            data: Record<string, unknown>;
            entityType: string;
            id: string;
            op: "upsert";
        }
        | {
            data: Record<string, unknown>;
            entityType: string;
            id: string;
            op: "replace";
        }
        | { entityType: string; id: string; op: "remove" }
        | {
            entityType: string;
            id: string;
            op: "patch";
            patch: Record<string, unknown>;
        }
        | { entityType: string; id: string; op: "clearPatch" }

    A graph mutation transported inside an official A2A structured-data Part.