/**
 * Run state machine for @a5c-ai/agent-mux.
 *
 * Defines the 9 RunState values, valid transition map, terminal state set,
 * and guard helpers used by RunHandleImpl.
 */
/**
 * All valid states for an agent run.
 *
 * States are mutually exclusive; every run is in exactly one state at a time.
 * Terminal states are absorbing — no transitions out.
 */
export type RunState = 'spawned' | 'running' | 'paused' | 'interrupted' | 'aborted' | 'timed-out' | 'completed' | 'crashed' | 'killed';
/** Set of states from which no further transitions are possible. */
export declare const TERMINAL_STATES: ReadonlySet<RunState>;
/**
 * Map of (fromState -> Set<toState>) defining all legal state transitions.
 *
 * Transitions not listed here are invalid and will throw
 * AgentMuxError('INVALID_STATE_TRANSITION', ...).
 */
export declare const VALID_TRANSITIONS: ReadonlyMap<RunState, ReadonlySet<RunState>>;
/**
 * Returns true when the state is terminal (no transitions out).
 */
export declare function isTerminal(state: RunState): boolean;
/**
 * Assert that transitioning from `from` to `to` is valid.
 *
 * @throws {AgentMuxError} code `INVALID_STATE_TRANSITION` when the transition
 *         is not in the VALID_TRANSITIONS map.
 */
export declare function assertTransition(from: RunState, to: RunState): void;