/**
 * Start the outbox tail. Idempotent — second call no-ops. Initializes the
 * in-memory cursor to MAX(id) so a fresh daemon start does NOT replay every
 * historical row to current subscribers.
 *
 * Call ONLY from the HTTP daemon entry point (src/index.ts). Stdio sessions
 * don't need the tail — they have direct access to the in-process bus for
 * any subscriber that happens to live in the same process, and stdio
 * subscribers from a different process are not a supported topology.
 */
export declare function startOutboxTail(): void;
/**
 * Stop the outbox tail. Cancels any pending timer + flips the stopping flag
 * so an in-flight tick won't reschedule itself. Safe to call multiple times.
 */
export declare function stopOutboxTail(): void;
/** Test-only: current in-memory cursor. Used by Phase 3d cross-process test. */
export declare function _currentCursorForTests(): number;
/** Test-only: reset internal state between cases. */
export declare function _resetOutboxTailForTests(): void;
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