export interface PMFailureRecord {
    context: string;
    message: string;
    timestamp: number;
    count: number;
}
export interface PMStatusReport {
    pm_lite_healthy: boolean;
    pm_full_healthy: boolean;
    failure_count: number;
    recent_failures: PMFailureRecord[];
    uptime_ms: number;
}
export declare class PMDiagnosticsTracker {
    private readonly failures;
    private readonly startTime;
    /**
     * Record a PM subsystem failure. Subsequent failures for the same context
     * increment the count rather than creating duplicate entries.
     */
    recordFailure(context: string, message: string): void;
    /**
     * Return a status report summarising PM subsystem health.
     * pm_lite_healthy = no context has failed 3+ times
     * pm_full_healthy = zero failures
     */
    getStatus(): PMStatusReport;
    /** Reset all tracked failures (e.g. after a PM mode toggle). */
    reset(): void;
}
/**
 * Execute a PM operation safely inside an isolation boundary.
 *
 * On success: returns the operation result.
 * On any error:
 *   - Logs with [Engram/PM] prefix to console.error (never console.log).
 *   - Records the failure in the tracker when one is provided.
 *   - Returns the fallback value silently.
 *
 * @param operation  The PM feature code to run.
 * @param fallback   Safe default to return on failure.
 * @param context    Human-readable label for diagnostic messages.
 * @param tracker    Optional diagnostics tracker; pass `null` when not yet available.
 */
export declare function pmSafe<T>(operation: () => T, fallback: T, context: string, tracker?: PMDiagnosticsTracker | null): T;
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