/**
 * Phase 3 event-sync tests (US-017/US-018/US-019).
 *
 * - resolveEventSync: exact-email gate semantics + env-override precedence.
 * - subscribeSyncReceive: request shape, response validation, failure surface.
 * - sqsClientFromAwsSdk: command mapping + abort-signal forwarding.
 * - createRefreshingSqsClient: proactive skew refresh, reactive retry-once on
 *   expiry-class errors, non-expiry errors propagate, concurrent refresh
 *   collapse.
 * - startEventSync: happy-path handle wiring (self-echo filter, publish leg),
 *   poll-only degradation on subscribe/tenant failure.
 */
export {};
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