/**
 * Bound a unified diff to a byte budget before it is sent to an AI verifier.
 * Truncation is explicit: an oversized diff is cut to `capBytes` and a literal
 * marker is appended so the model (and the SUMMARY provenance) know the diff is
 * partial. Pure — no I/O.
 */
export interface CappedDiff {
    /** The diff to send, with a truncation marker appended when clipped. */
    diff: string;
    /** True when the raw diff exceeded `capBytes`. */
    truncated: boolean;
    /** Byte length (UTF-8) of the raw diff before any truncation. */
    originalBytes: number;
}
export declare function capDiff(raw: string, capBytes: number): CappedDiff;
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