feat: TTL pruning, retry jitter, priority queue, webhook HMAC enforcement - #788
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…ment - claimableBalanceFallback: add per-entry TTL (default 24h), pruneExpired() method that removes stale entries and returns count, auto-prune on every track() call to prevent unbounded memory growth. Closes Stellar-split#735 - retryEngine: add RetryEngineOptions.jitterFactor (0-1, default 0.2); each computed delay is multiplied by a random value in [1-jf, 1+jf] to spread retry storms. jitterFactor=0 disables jitter entirely and skips the Math.random call. Closes Stellar-split#733 - queue: enqueue() accepts an optional priority (higher = dequeued first); equal-priority items preserve FIFO insertion order via binary insertion. Add peek() to inspect the next-to-drain item without removing it. Closes Stellar-split#732 - webhookValidator: add validateWebhook(payload, rawBody, secret, signature) that verifies hmac-sha256= formatted signatures using Node.js crypto.timingSafeEqual; throws WebhookSignatureError on mismatch; passes when secret is null (opt-out mode). Closes Stellar-split#731
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claimableBalanceFallback: add per-entry TTL (default 24h), pruneExpired() method that removes stale entries and returns count, auto-prune on every track() call to prevent unbounded memory growth. Closes Add HMAC-SHA256 signature verification to webhookValidator #735
retryEngine: add RetryEngineOptions.jitterFactor (0-1, default 0.2); each computed delay is multiplied by a random value in [1-jf, 1+jf] to spread retry storms. jitterFactor=0 disables jitter entirely and skips the Math.random call. Closes Add priority-based ordering to the queue module #733
queue: enqueue() accepts an optional priority (higher = dequeued first); equal-priority items preserve FIFO insertion order via binary insertion. Add peek() to inspect the next-to-drain item without removing it. Closes Add per-attempt jitter to retry backoff intervals in retryEngine #732
webhookValidator: add validateWebhook(payload, rawBody, secret, signature) that verifies hmac-sha256= formatted signatures using Node.js crypto.timingSafeEqual; throws WebhookSignatureError on mismatch; passes when secret is null (opt-out mode). Closes Add TTL expiry tracking for claimable balance entries in claimableBalanceFallback #731