Function parseClaudeUsage

Returns
    | {
        buckets?: {
            id: string;
            name: string;
            remainingFraction: number;
            resetTime: string;
            window: string;
        }[];
        headroomPercent?: number
        | null;
        measured: boolean;
        resetsAt?: string | null;
        usedPercent?: number | null;
        window?: string;
    }
    | undefined

The bottleneck quota, or undefined when no limit line is present (for example API-key billing).