/**
 * Base error class for all Engram errors.
 * Includes an error code and optional context for structured error handling.
 */
export declare class EngramError extends Error {
    readonly code: string;
    readonly context?: Record<string, unknown>;
    constructor(message: string, code?: string, context?: Record<string, unknown>);
}
/**
 * Thrown when a requested entity is not found.
 */
export declare class NotFoundError extends EngramError {
    constructor(entity: string, id: string | number);
}
/**
 * Thrown when input validation fails beyond what Zod catches.
 */
export declare class ValidationError extends EngramError {
    constructor(message: string, context?: Record<string, unknown>);
}
/**
 * Thrown when a database operation fails.
 */
export declare class DatabaseError extends EngramError {
    constructor(message: string, context?: Record<string, unknown>);
}
/**
 * Thrown when a safety confirmation is missing or incorrect.
 */
export declare class SafetyCheckError extends EngramError {
    constructor(expectedConfirm: string);
}
/**
 * Thrown when no active session exists for an operation that requires one.
 */
export declare class NoActiveSessionError extends EngramError {
    constructor();
}
/**
 * Base class for all PM framework errors.
 * PM errors are non-fatal — they degrade PM features without blocking core
 * Engram operations. Catch with PMFrameworkError to handle all PM failures.
 */
export declare class PMFrameworkError extends EngramError {
    constructor(message: string, code?: string, context?: Record<string, unknown>);
}
/**
 * Thrown when a knowledge base query fails (data corruption, missing entry, bad input).
 */
export declare class PMKnowledgeError extends PMFrameworkError {
    constructor(message: string, context?: Record<string, unknown>);
}
/**
 * Thrown when a workflow advisor check fails (state inconsistency, repo error).
 */
export declare class PMAdvisorError extends PMFrameworkError {
    constructor(message: string, context?: Record<string, unknown>);
}
/**
 * Thrown when phase detection or phase gate automation fails.
 */
export declare class PMPhaseError extends PMFrameworkError {
    constructor(message: string, context?: Record<string, unknown>);
}
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