20098c6108
Reconciliation cursor becomes composite (UpdatedAtUtc, TrackedOperationId); IPullSiteCallsClient/GrpcPullSiteCallsClient forward the Task-15 after_id keyset (additive param, null preserves the legacy inclusive >= contract). A burst sharing one exact UpdatedAtUtc now drains via the id tiebreak instead of pinning forever. A legacy site that ignores after_id is latched + published as SiteCallReconciliationPinnedChanged on the EventStream (transition-only), replacing the prior silent log line.