/**
 * Drift between the vision document and the snapshot it was last read from.
 *
 * Because statement ids are content-addressed, drift is a set difference: ids in
 * the source and not the snapshot were **added**, ids in the snapshot and not the
 * source were **removed** — and an edited statement shows up as one of each,
 * which is the honest description of what happened.
 *
 * The three states that are not `ok` are reported explicitly rather than
 * collapsing into "no drift". A check that cannot evaluate must say so; a silent
 * no-op is indistinguishable from success (`design-reads-existing-seams`,
 * 2026-09-03).
 *
 * Requirements: project-constitution/AC-12, project-constitution/AC-13,
 * project-constitution/AC-15
 *
 * @module
 */
import type { CheckReport } from './types.js';
/** Compare the recorded source against the snapshot. Never throws, never mutates. */
export declare function checkDrift(projectRoot: string): CheckReport;
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