Function loadFleetConfig

Returns {
    allowedUpstreams: string[];
    defaultRiskTier: "low" | "med" | "high" | "critical";
    globalPolicies: { privacy: string; redaction: string; retention: string };
    mandatoryTrustTierForLevel5: "OBSERVED" | "ATTESTED" | "SELF_REPORTED";
    orgName: string;
}