/**
 * 24h mode state machine — state types + DecisionKey enum.
 *
 * capture the lifecycle of a 24h code run; the DecisionKey enum is the
 * enumeration of B1/B2 decision keys whose retry counter lives in
 * `AttemptsMap`. Persistence and trigger evaluation live in sibling
 * files; this module is pure data so the persistence tests can
 * round-trip without pulling in IO and the decider tests can be
 * exercised on an in-memory map.
 */
export declare const STATES: readonly ["IDLE", "BRAINSTORM", "USER_CONFIRM", "24H_ACTIVE", "WAITING_USER", "HANDOFF"];
export type State = (typeof STATES)[number];
/**
 * Reasons recorded in the persisted `attempts` map. Mirrors the
 * 7 B3 trigger rows in the v2 proposal §1 (B3 trigger table) plus
 * generic B1/B2 retry keys (per-key independence in AC-T3).
 */
export declare const DECISION_KEYS: readonly ["prd_direction_change", "blocker_3_consecutive_slices", "registry_affecting_failure", "destructive_irreversible_op", "any_B1_B2_failure_3x_non_converging", "runtime_or_shared_version_mismatch", "sub-agent_stale_5min_x3"];
export type DecisionKey = (typeof DECISION_KEYS)[number];
/**
 * B3 trigger threshold: per decision key, the 3rd consecutive fire
 * escalates. Lower thresholds are not configurable here — proposal
 * pins the constant so QA v3 can verify.
 */
export declare const B3_THRESHOLD = 3;
/**
 * The persisted shape for `.peaks/_runtime/<sessionId>/24h-state.json`.
 * `enteredAt` is the ISO timestamp of the most recent state
 * transition; `enteredFrom` is the previous state (or `null` for the
 * IDLE bootstrap). `attempts` is keyed by `DecisionKey` and
 * monotonically incremented by `fireB3`.
 */
export interface State24hSnapshot {
    state: State;
    enteredAt: string;
    enteredFrom: State | null;
    activeSlices: string[];
    monotonicGuards: number;
    autoCompactCount: number;
    checkpoints: number;
    lastCheckpointAt: string | null;
    attempts: Record<DecisionKey, number>;
    exitCondition: string | null;
}
export declare function isState(value: string): value is State;
export declare function isDecisionKey(value: string): value is DecisionKey;
export declare function emptyAttempts(): Record<DecisionKey, number>;