/**
 * SMI-4316: rateLimited() unit tests.
 *
 * Covers:
 *   1. First-N events (<= FIRST_N) always return true.
 *   2. Sampled-after-N events follow the 1-in-SAMPLE_EVERY cadence.
 *   3. Per-key isolation (one key's flood does not starve another key).
 *   4. Window rollover when `now` advances beyond WINDOW_MS.
 */
export {};
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