/**
 * Structural Change Analysis — graph diff (spec-21).
 *
 * Given a change (working tree vs a ref, or two refs), compute what changed
 * *structurally*: which functions/edges were added or removed, which signatures
 * changed, and which existing callers are now STALE because a callee's signature
 * moved under them. A review/refactor agent gets a precise structural changelog
 * instead of re-deriving consequences from a raw text diff.
 *
 * The difference between "these 40 lines changed" (git diff) and "this removed
 * function C, altered the signature of D, and 5 of D's callers are now stale"
 * (graph diff) — a computed consequence (Layer 3), not retrieval.
 *
 * Bounded: only the changed files are re-parsed (old content via `git show`, new
 * via the working tree / ref), so two in-memory snapshots are cheap. The canonical
 * graph is never mutated. Stale callers come from the cached graph (all callers).
 *
 * Honest limits: a moved/renamed-file symbol is matched exactly by its
 * content-addressed stable id (the same symbol, not delete+add). Identifier
 * renames and symbols with no stable id stay heuristic — both interpretations are
 * reported, never silently guessed.
 */
export interface StructuralDiffInput {
    directory: string;
    /** Old state (default "HEAD"). */
    baseRef?: string;
    /** New state. Omit to use the working tree. */
    headRef?: string;
    /** Cap reported items per category (default 200). */
    maxResults?: number;
}
export declare function handleStructuralDiff(input: StructuralDiffInput): Promise<unknown>;
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