/**
 * Markdown plan serialization — round-trippable Plan <-> Markdown.
 * YAML frontmatter + structured markdown with tasks as ### subsections.
 */
import type { Plan } from "./types.js";
/**
 * Serialize a Plan object to a human-readable markdown string.
 */
export declare function serializePlanToMarkdown(plan: Plan): string;
/**
 * Parse a markdown plan string back into a Plan object.
 */
export declare function parsePlanFromMarkdown(content: string): Plan;
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