export type MigrationCategory = "A" | "B" | "C" | "D";
export interface MigrationCandidateResult {
    eligible: boolean;
    category: MigrationCategory;
    reasons: string[];
    /** 已交付产物数(passed artifact_structure + run 绑定,验证通过)。 */
    evidence_count: number;
    /** 该 task 迁移将生成的 RequirementContract 数(A=1;其余=0)。 */
    estimated_requirements: number;
}
/**
 * 只读验证 migration 候选资格。
 * A = done + 前 cutoff + 0 req + 有 delivered evidence → eligible
 * B = active + 前 cutoff + 0 req + 有 evidence → 须人工确认(REQUIRE_MANUAL_REQUIREMENT)
 * C = 后 cutoff(新项目)/ 已迁移 / 已有 req / 无 evidence → reject
 * D = cancelled 等其他状态 → 不迁移
 */
export declare function validateMigrationCandidate(taskId: string, projectRoot: string, cutoff: number): Promise<MigrationCandidateResult>;