/**
 * @fileoverview Heuristic change classifier for skill content diffs
 * @module @skillsmith/core/versioning/change-classifier
 * @see SMI-skill-version-tracking Wave 2
 *
 * Compares old and new SKILL.md content to produce a semantic change type:
 *   'major'   — structural regression (headings removed, large risk delta)
 *   'minor'   — new structure added (headings added only, dep added)
 *   'patch'   — body edits with no structural changes
 *   'unknown' — could not classify
 *
 * When the author provides a semver field in SKILL.md frontmatter the
 * caller should pass that through; this module trusts the semver bump
 * over heuristics when it is present and parseable.
 */
export type ChangeType = 'major' | 'minor' | 'patch' | 'unknown';
/**
 * Classify the change between two versions of a SKILL.md.
 *
 * Order of precedence:
 *  1. Author-provided semver in frontmatter (trusted over heuristics)
 *  2. Removed headings → 'major'
 *  3. Risk score delta > 20 → upgrade to 'major'
 *  4. Removed dependencies → 'major'
 *  5. Added headings only → 'minor'
 *  6. Added dependencies → 'minor'
 *  7. Body edits with no structural changes → 'patch'
 *  8. No detectable change → 'patch'
 *  9. Error during classification → 'unknown'
 *
 * @param oldContent    Previous SKILL.md content
 * @param newContent    Updated SKILL.md content
 * @param oldRiskScore  Risk score of the old version (0–100, optional)
 * @param newRiskScore  Risk score of the new version (0–100, optional)
 * @returns Semantic change type
 */
export declare function classifyChange(oldContent: string, newContent: string, oldRiskScore?: number, newRiskScore?: number): ChangeType;
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