/**
 * Metadata attached to transport messages.
 *
 * Leslie Lamport (TLA+, Turing Award):
 *   "The timestamp is a logical clock value, not a physical time.
 *    It provides causal ordering, not wall-clock synchronization."
 */
export interface ITransportMessageMeta {
    /** Topic subject */
    topic: string;
    /** Wall-clock timestamp (milliseconds since epoch) */
    ts: number;
    /**
     * Lamport logical clock for causal ordering.
     *
     * Optional in Phase 1 for backwards compatibility.
     * Use this to order messages causally, especially exit signals.
     *
     * If undefined, the message has no causal ordering guarantees.
     */
    lamportClock?: number;
}
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