/**
 * Stage State Machine — manages the stage lifecycle, including clarification-specific blocking.
 *
 * Valid transitions:
 *   pending                → active | skipped
 *   active                 → passed | failed | blocked | clarification-blocked
 *   blocked                → active          (unblock / retry)
 *   clarification-blocked  → active          (clarification settled)
 *   failed                 → active          (fix & retry)
 *
 * Terminal states: passed, skipped (no outgoing transitions).
 */
import type { StageStatus } from '../types/index.js';
export declare function isValidTransition(from: StageStatus, to: StageStatus): boolean;
export declare function assertTransition(from: StageStatus, to: StageStatus): void;
export declare function isTerminal(status: StageStatus): boolean;
export declare function canActivate(status: StageStatus): boolean;
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