/**
 * Event bus contract (matches @senpi/playbook).
 * Shared by runtime and DSL so runtime does not depend on DSL internals.
 */
export interface SenpiEventBus {
    emit(eventName: string, payload?: unknown): void;
    on(eventName: string, handler: (payload?: unknown) => void): void;
    /** Remove a single listener (same reference as passed to `on`). */
    off(eventName: string, handler: (payload?: unknown) => void): void;
    /** Remove all listeners. Call on shutdown to prevent zombie handlers. */
    removeAllListeners?(): void;
}
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