Function parseEvidenceCompletionLedger

Returns {
    ledger_id: string;
    records: {
        claim_id: string;
        evidence_ids: string[];
        status: "unknown" | "truncated" | "fail" | "pass" | "unsupported";
    }[];
    schema_version: 1;
    summary: {
        complete: boolean;
        fail: number;
        pass: number;
        total: number;
        truncated: number;
        unknown: number;
        unsupported: number;
    };
}