/**
 * strategies/collapse.ts
 *
 * Collapse strategy, full context collapse into a single compacted summary
 * message. This is the most aggressive strategy, used when token pressure
 * exceeds 85% or when manually triggered.
 *
 * All messages are reduced to a structured handoff that preserves:
 * - The original task context (if known)
 * - Key decisions and outcomes
 * - The most recent user/assistant exchange
 */
import type { StrategyInput, StrategyOutput } from '../types.js';
/**
 * Applies the collapse strategy: reduces all messages to a single structured
 * handoff message that preserves the essential session context.
 *
 * @param input - Strategy input containing messages and context.
 * @returns Strategy output with a single collapsed message.
 */
export declare function runCollapse(input: StrategyInput): StrategyOutput;
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