export interface SessionCheckpoint {
    timestamp: number;
    projectPath: string;
    filesModified: string[];
    decisionsMade: string[];
    bugsResolved: string[];
    tasksPending: string[];
    summary: string;
    tokenEstimate: number;
}
export declare function saveCheckpoint(checkpoint: Omit<SessionCheckpoint, 'timestamp' | 'tokenEstimate'>, projectRoot: string): SessionCheckpoint;
/**
 * Builds and saves a checkpoint from repository state alone.
 *
 * The model-driven path (calling `conversation_checkpoint` with action "save") depends on the
 * assistant remembering to do it at the end of a session, which in practice does not happen —
 * `.lemma/session/` did not exist in this repo across six releases. This derives what it can
 * from git without any model involvement, so a session-end hook can call it unconditionally.
 *
 * It cannot recover decisions or pending tasks — those only exist in the conversation. Those
 * fields stay empty here rather than being invented, and a model-written checkpoint that has
 * them is always the better record when one exists.
 */
export declare function captureAutoCheckpoint(projectRoot: string, summary?: string): SessionCheckpoint | null;
export declare function loadLatestCheckpoint(projectRoot: string): SessionCheckpoint | null;
/** Newest-first, for building a project-history view rather than just resuming the last session. */
export declare function loadRecentCheckpoints(projectRoot: string, limit?: number): SessionCheckpoint[];
export declare function buildCheckpointSummary(filesModified: string[], decisionsMade: string[], bugsResolved: string[], tasksPending: string[]): string;
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