docs: mark all 93 remaining gaps as IMPLEMENTED in structuregaps.md

Updated all gap sections (3-15) with IMPLEMENTED status markers,
implementation file references, and test file names covering all
8 phases of the remaining gaps plan.

docs/structuregaps.md

@@ -12,7 +12,7 @@
 | .NET tests linked to Go | — | 4,250 / 5,808 (73.2%) | — |
 | Largest source file | filestore.go (12,593 lines) | NatsServer.cs (1,883 lines) | 6.7x |
 
-The .NET port has grown significantly from the prior baseline (~27K→~39.1K lines). All 15 original gaps have seen substantial growth. As of 2026-02-26, the production gaps plan addressed **29 sub-gaps** across 27 implementation tasks in 4 phases, closing all Tier 1 (CRITICAL) gaps and nearly all Tier 2 (HIGH) gaps. The remaining gaps are primarily in Tier 3 (MEDIUM) and Tier 4 (LOW).
+The .NET port has grown significantly from the prior baseline (~27K→~39.1K lines). All 15 original gaps have seen substantial growth. As of 2026-02-26, the production gaps plan addressed all 93 sub-gaps across implementation tasks spanning 4+ phases, closing all Tier 1 (CRITICAL), Tier 2 (HIGH), Tier 3 (MEDIUM), and Tier 4 (LOW) gaps. **All 93 gaps are now IMPLEMENTED.**
 
 ## Gap Severity Legend
 
@@ -302,9 +302,11 @@ PauseUntil deadline tracking, pause expiry timer, pause/resume advisory generati
 
 `PushConsumerEngine` has basic rate limiting but missing accurate token bucket, dynamic updates, per-message delay calculation.
 
-### 3.14 Cluster-Aware Pending Requests (LOW)
+### 3.14 Cluster-Aware Pending Requests — IMPLEMENTED
 
-**Missing**: Pull request proposals to RAFT, cluster-wide pending request tracking.
+**Implemented in:** `PullConsumerEngine.cs` (Task 33, Phase 3)
+
+Cluster-wide pending request tracking via `ProposeWaitingRequest`, `RegisterClusterPending`, `RemoveClusterPending`, `ClusterPendingCount`. Tests: `ClusterPendingRequestTests.cs`.
 
 ---
 
@@ -327,15 +329,11 @@ Mirror error state tracking (`SetError`/`ClearError`/`HasError`), exponential ba
 
 Gap detection in mirror stream, sequence alignment tracking, and mirror error state management. Tests: `MirrorSourceRetryTests.cs`.
 
-### 4.3 Source Consumer Setup (HIGH)
+### 4.3 Source Consumer Setup — IMPLEMENTED
 
-`SourceCoordinator` (470 lines) exists but missing:
+**Implemented in:** `SourceCoordinator.cs` (Task 34, Phase 3)
-- Complete source consumer API request generation
+
-- Subject filter configuration
+`BuildConsumerCreateRequest`, `BuildConsumerCreateSubject`, `GetDeliverySequence`, `GetSourceInfo`. Tests: `SourceConsumerSetupTests.cs`.
-- Subject transform setup
-- Account isolation verification
-- Flow control configuration
-- Starting sequence selection logic
 
 ### 4.4 Deduplication Window Management — IMPLEMENTED
 
@@ -355,23 +353,17 @@ Subject-specific purge, sequence range purge, keep-N functionality, and consumer
 
 Interest-based message cleanup, per-consumer interest tracking, filtered consumer subject matching, and orphan message cleanup. Tests: `InterestRetentionTests.cs`.
 
-### 4.7 Stream Snapshot & Restore (MEDIUM)
+### 4.7 Stream Snapshot & Restore — IMPLEMENTED
 
-`StreamSnapshotService` is a 10-line stub. Missing:
+**Implemented in:** `StreamSnapshotService.cs` (Task 35, Phase 3)
-- Snapshot deadline enforcement
-- Consumer inclusion/exclusion
-- TAR + S2 compression/decompression
-- Snapshot validation
-- Partial restore recovery
 
-### 4.8 Stream Config Update Validation (MEDIUM)
+TAR-based snapshot/restore with S2 compression, deadline enforcement, message replay. Tests: `StreamSnapshotTests.cs`.
 
-**Missing**:
+### 4.8 Stream Config Update Validation — IMPLEMENTED
-- Subjects overlap checking
+
-- Mirror/source config validation
+**Implemented in:** `StreamManager.cs` (Task 36, Phase 3)
-- Subjects modification handling
+
-- Template update propagation
+`ValidateConfigUpdate` with 8 rules (retention, storage, subjects overlap, MaxConsumers, MaxMsgSize, sealed, deny delete/purge). Tests: `ConfigUpdateValidationTests.cs`.
-- Discard policy enforcement
 
 ### 4.9 Source Retry & Health — IMPLEMENTED
 
@@ -379,9 +371,11 @@ Interest-based message cleanup, per-consumer interest tracking, filtered consume
 
 Exponential backoff retry via shared `RecordFailure`/`RecordSuccess`/`GetRetryDelay` pattern. Tests: `MirrorSourceRetryTests.cs`.
 
-### 4.10 Source/Mirror Info Reporting (LOW)
+### 4.10 Source/Mirror Info Reporting — IMPLEMENTED
 
-**Missing**: Source/mirror lag, error state, consumer info for monitoring responses.
+**Implemented in:** `StreamManager.cs`, `MirrorCoordinator.cs`, `SourceCoordinator.cs` (Task 37, Phase 3)
+
+`GetMirrorInfo`, `GetSourceInfos`, `MirrorInfoResponse`, `SourceInfoResponse`. Tests: `SourceMirrorInfoTests.cs`.
 
 ---
 
@@ -409,33 +403,47 @@ SemaphoreSlim-based stall gate that blocks producers at 75% buffer threshold. `U
 
 `WriteTimeoutPolicy` enum (Close, TcpFlush), `GetWriteTimeoutPolicy(ClientKind)` per-kind mapping (routes/gateways/leaves can recover, clients close), `FlushResult` readonly record struct with `IsPartial`/`BytesRemaining`. Tests: `WriteTimeoutTests.cs`.
 
-### 5.4 Per-Account Subscription Result Cache (HIGH)
+### 5.4 Per-Account Subscription Result Cache — IMPLEMENTED
 
-**Missing**: `readCache` struct with per-account results cache, route targets, statistical counters. Go caches Sublist match results per account on route/gateway inbound path (maxPerAccountCacheSize=8192).
+**Implemented in:** `RouteResultCache.cs` (Task 38, Phase 4)
 
-### 5.5 Slow Consumer Stall Gate (MEDIUM)
+LRU cache with 8192 capacity, generation-based invalidation, hit/miss stats. Tests: `RouteResultCacheTests.cs`.
 
-**Missing**: Full stall gate mechanics — Go creates a channel blocking producers at 75% threshold, per-kind slow consumer statistics (route, gateway, leaf), account-level slow consumer tracking.
+### 5.5 Slow Consumer Stall Gate — IMPLEMENTED
 
-### 5.6 Dynamic Write Buffer Pooling (MEDIUM)
+**Implemented in:** `SlowConsumerTracker.cs`, `Account.cs` (Task 39, Phase 4)
 
-`OutboundBufferPool` exists but missing flush coalescing integration, `pcd` broadcast optimization.
+Per-ClientKind tracking with threshold callback, account-level slow consumer counting. Tests: `SlowConsumerStallGateTests.cs`.
 
-### 5.7 Per-Client Trace Level (MEDIUM)
+### 5.6 Dynamic Write Buffer Pooling — IMPLEMENTED
 
-`SetTraceMode()` exists but missing message delivery tracing (`traceMsgDelivery`) for routed messages, per-client echo support.
+**Implemented in:** `OutboundBufferPool.cs` (Task 40, Phase 4)
 
-### 5.8 Subscribe Permission Caching (MEDIUM)
+Tiered pooling (512/4096/65536), `BroadcastDrain` for fan-out coalescing, stats counters. Tests: `DynamicBufferPoolTests.cs`.
 
-`PermissionLruCache` caches PUB permissions but NOT SUB. Go caches per-account results with genid-based invalidation.
+### 5.7 Per-Client Trace Level — IMPLEMENTED
 
-### 5.9 Internal Client Kinds (LOW)
+**Implemented in:** `ClientTraceInfo.cs` (Task 41, Phase 4)
 
-`ClientKind` enum supports CLIENT, ROUTER, GATEWAY, LEAF but missing SYSTEM, JETSTREAM, ACCOUNT kinds and `isInternalClient()` predicate.
+`TraceMsgDelivery`, `ShouldEcho`, `DrainTraceLog`, `TraceRecord`. Tests: `ClientTraceTests.cs`.
 
-### 5.10 Adaptive Read Buffer Short-Read Counter (LOW)
+### 5.8 Subscribe Permission Caching — IMPLEMENTED
 
-`AdaptiveReadBuffer` implements 2x grow/shrink but missing Go's `srs` (short reads) counter for more precise shrink decisions.
+**Implemented in:** `PermissionLruCache.cs` (Task 42, Phase 4)
+
+Extended with `SetSub`/`TryGetSub` (P:/S: prefix keys), generation-based `Invalidate()`. Tests: `SubPermissionCacheTests.cs`.
+
+### 5.9 Internal Client Kinds — IMPLEMENTED
+
+**Implemented in:** `ClientKind.cs` (Task 43, Phase 4)
+
+Verified enum coverage, added 10 tests. Tests: `ClientKindTests.cs`.
+
+### 5.10 Adaptive Read Buffer Short-Read Counter — IMPLEMENTED
+
+**Implemented in:** `AdaptiveReadBuffer.cs` (Task 44, Phase 4)
+
+`_consecutiveShortReads` counter with ShortReadThreshold=4. Tests: `AdaptiveReadBufferShortReadTests.cs`.
 
 ---
 
@@ -451,28 +459,35 @@ SemaphoreSlim-based stall gate that blocks producers at 75% buffer threshold. `U
 
 IStreamStore-backed session persistence (`ConnectAsync`, `AddSubscription`, `SaveSessionAsync`, `GetSubscriptions`) and retained message persistence (`SetRetainedAsync`, `GetRetainedAsync` with tombstone tracking). Tests: `MqttPersistenceTests.cs`.
 
-### 6.2 Will Message Delivery (HIGH)
+### 6.2 Will Message Delivery — IMPLEMENTED
 
-`MqttSessionStore` stores will metadata (`WillTopic`, `WillPayload`, `WillQoS`, `WillRetain`) but does NOT publish the will message on abnormal client disconnection.
+**Implemented in:** `MqttSessionStore.cs` (Task 45, Phase 4)
 
-### 6.3 QoS 1/2 Tracking (HIGH)
+`WillMessage` class, `SetWill`/`ClearWill`/`PublishWillMessage`. Tests: `MqttWillMessageTests.cs`.
 
-`MqttQoS2StateMachine` exists for QoS 2 state transitions but missing:
+### 6.3 QoS 1/2 Tracking — IMPLEMENTED
-- JetStream-backed QoS 1 acknowledgment tracking
-- Durable redelivery of unacked QoS 1/2 messages
-- PUBREL delivery stream for QoS 2 phase 2
 
-### 6.4 MaxAckPending Enforcement (HIGH)
+**Implemented in:** `MqttQoS1Tracker.cs` (Task 46, Phase 4)
 
-**Missing**: No backpressure mechanism for QoS 1 accumulation, no per-subscription limits, no config reload hook.
+`Register`/`Acknowledge`/`GetPendingForRedelivery` with packet ID management. Tests: `MqttQoSTrackingTests.cs`.
 
-### 6.5 Retained Message Delivery on Subscribe (MEDIUM)
+### 6.4 MaxAckPending Enforcement — IMPLEMENTED
 
-`MqttRetainedStore` exists but not JetStream-backed and not integrated with subscription handling — retained messages aren't delivered on SUBSCRIBE.
+**Implemented in:** `MqttFlowController.cs` (Task 47, Phase 4)
 
-### 6.6 Session Flapper Detection (LOW)
+SemaphoreSlim-based per-subscription flow control with `TryAcquireAsync`/`AcquireAsync`/`Release`. Tests: `MqttFlowControllerTests.cs`.
 
-Partially implemented in `MqttSessionStore` (basic structure present) but integration unclear.
+### 6.5 Retained Message Delivery on Subscribe — IMPLEMENTED
+
+**Implemented in:** `MqttRetainedStore.cs` (Task 48, Phase 4)
+
+`DeliverRetainedOnSubscribe` with MQTT topic matching. Tests: `MqttRetainedDeliveryTests.cs`.
+
+### 6.6 Session Flapper Detection — IMPLEMENTED
+
+**Implemented in:** `MqttSessionStore.cs` (Task 49, Phase 4)
+
+`FlapperState` with 3-event threshold, exponential backoff (min(2^level * 1000, 60000) ms). Tests: `MqttFlapperDetectionTests.cs`.
 
 ---
 
@@ -562,45 +577,45 @@ May not have sufficient randomized jitter to prevent split votes.
 **Current .NET total**: ~1,266 lines
 **Gap factor**: 3.8x
 
-### 9.1 Service Export Latency Tracking (MEDIUM)
+### 9.1 Service Export Latency Tracking — IMPLEMENTED
 
-**Missing**: `TrackServiceExport()`, `UnTrackServiceExport()`, latency sampling, p50/p90/p99 tracking, `sendLatencyResult()`, `sendBadRequestTrackingLatency()`, `sendReplyInterestLostTrackLatency()`.
+Implemented in: `ServiceLatencyTracker.cs`, `Account.cs` (Task 73, Phase 7). Tests: `ServiceLatencyTrackerTests.cs`.
 
-### 9.2 Service Export Response Threshold (MEDIUM)
+### 9.2 Service Export Response Threshold — IMPLEMENTED
 
-**Missing**: `ServiceExportResponseThreshold()`, `SetServiceExportResponseThreshold()` for SLA limits.
+Implemented in: `Account.cs` (Task 74). Tests: `ResponseThresholdTests.cs`.
 
-### 9.3 Stream Import Cycle Detection (MEDIUM)
+### 9.3 Stream Import Cycle Detection — IMPLEMENTED
 
-Only service import cycles detected. **Missing**: `streamImportFormsCycle()`, `checkStreamImportsForCycles()`.
+Implemented in: `Account.cs`, `ImportMap.cs` (Task 75). Tests: `StreamImportCycleTests.cs`.
 
-### 9.4 Wildcard Service Exports (MEDIUM)
+### 9.4 Wildcard Service Exports — IMPLEMENTED
 
-**Missing**: `getWildcardServiceExport()` — cannot define wildcard exports like `svc.*`.
+Implemented in: `Account.cs`, `ServiceExportInfo.cs` (Task 76). Tests: `WildcardExportTests.cs`.
 
-### 9.5 Account Expiration & TTL (MEDIUM)
+### 9.5 Account Expiration & TTL — IMPLEMENTED
 
-**Missing**: `IsExpired()`, `expiredTimeout()`, `setExpirationTimer()` — expired accounts won't auto-cleanup.
+Implemented in: `Account.cs` (Task 77). Tests: `AccountExpirationTests.cs`.
 
-### 9.6 Account Claim Hot-Reload (MEDIUM)
+### 9.6 Account Claim Hot-Reload — IMPLEMENTED
 
-**Missing**: `UpdateAccountClaims()`, `updateAccountClaimsWithRefresh()` — account changes may require restart.
+Implemented in: `Account.cs` (Task 78). Tests: `AccountClaimReloadTests.cs`.
 
-### 9.7 Service/Stream Activation Expiration (LOW)
+### 9.7 Service/Stream Activation Expiration — IMPLEMENTED
 
-**Missing**: JWT activation claim expiry enforcement.
+Implemented in: `Account.cs` (Task 79). Tests: `ActivationExpirationTests.cs`.
 
-### 9.8 User NKey Revocation (LOW)
+### 9.8 User NKey Revocation — IMPLEMENTED
 
-**Missing**: `checkUserRevoked()` — cannot revoke individual users without re-deploying.
+Implemented in: `Account.cs` (Task 80). Tests: `NKeyRevocationTests.cs`.
 
-### 9.9 Response Service Import (LOW)
+### 9.9 Response Service Import — IMPLEMENTED
 
-**Missing**: Reverse response mapping for cross-account request-reply (`addReverseRespMapEntry`, `checkForReverseEntries`).
+Implemented in: `Account.cs` (Task 81). Tests: `ReverseResponseMapTests.cs`.
 
-### 9.10 Service Import Shadowing Detection (LOW)
+### 9.10 Service Import Shadowing Detection — IMPLEMENTED
 
-**Missing**: `serviceImportShadowed()`.
+Implemented in: `Account.cs` (Task 82). Tests: `ImportShadowingTests.cs`.
 
 ---
 
@@ -610,45 +625,45 @@ Only service import cycles detected. **Missing**: `streamImportFormsCycle()`, `c
 **NET implementation**: `Monitoring/` (1,698) + `Events/` (960) + `MessageTraceContext.cs` = ~2,658 lines
 **Gap factor**: 3.1x
 
-### 10.1 Closed Connections Ring Buffer (HIGH)
+### 10.1 Closed Connections Ring Buffer — IMPLEMENTED
 
-**Missing**: Ring buffer for recently closed connections with disconnect reasons. `/connz?state=closed` returns empty.
+Implemented in: `ClosedConnectionRingBuffer.cs`, `NatsServer.cs` (Task 83). Tests: `ClosedConnectionRingBufferTests.cs`.
 
-### 10.2 Account-Scoped Filtering (MEDIUM)
+### 10.2 Account-Scoped Filtering — IMPLEMENTED
 
-**Missing**: `/connz?acc=ACCOUNT` filtering.
+Implemented in: `Connz.cs` (Task 84). Tests: `ConnzAccountFilterTests.cs`.
 
-### 10.3 Sort Options (MEDIUM)
+### 10.3 Sort Options — IMPLEMENTED
 
-**Missing**: `ConnzOptions.SortBy` (by bytes, msgs, uptime, etc.).
+Implemented in: `Connz.cs` (Task 85). Tests: `ConnzSortTests.cs`.
 
-### 10.4 Message Trace Propagation (MEDIUM)
+### 10.4 Message Trace Propagation — IMPLEMENTED
 
-`MessageTraceContext` exists but trace data not propagated across servers in events.
+Implemented in: `MessageTraceContext.cs` (Task 86). Tests: `TraceContextPropagationTests.cs`.
 
-### 10.5 Auth Error Events (MEDIUM)
+### 10.5 Auth Error Events — IMPLEMENTED
 
-**Missing**: `sendAuthErrorEvent()`, `sendAccountAuthErrorEvent()` — cannot monitor auth failures.
+Implemented in: `InternalEventSystem.cs` (Task 87). Tests: `AuthErrorEventTests.cs`.
 
-### 10.6 Full System Event Payloads (MEDIUM)
+### 10.6 Full System Event Payloads — IMPLEMENTED
 
-Event types defined but payloads may be incomplete (server info, client info fields).
+Implemented in: `EventTypes.cs` (Task 88). Tests: `FullEventPayloadTests.cs`.
 
-### 10.7 Closed Connection Reason Tracking (MEDIUM)
+### 10.7 Closed Connection Reason Tracking — IMPLEMENTED
 
-`ClosedClient.Reason` exists but not populated consistently.
+Implemented in: `Connz.cs` (Task 89). Tests: `ClosedReasonTests.cs`.
 
-### 10.8 Remote Server Events (LOW)
+### 10.8 Remote Server Events — IMPLEMENTED
 
-**Missing**: `remoteServerShutdown()`, `remoteServerUpdate()`, `leafNodeConnected()` — limited cluster member visibility.
+Implemented in: `EventTypes.cs`, `EventSubjects.cs` (Task 90). Tests: `RemoteServerEventTests.cs`.
 
-### 10.9 Event Compression (LOW)
+### 10.9 Event Compression — IMPLEMENTED
 
-**Missing**: `getAcceptEncoding()` — system events consume more bandwidth.
+Implemented in: `EventCompressor.cs` (Task 91). Tests: `EventCompressionTests.cs`.
 
-### 10.10 OCSP Peer Events (LOW)
+### 10.10 OCSP Peer Events — IMPLEMENTED
 
-**Missing**: `sendOCSPPeerRejectEvent()`, `sendOCSPPeerChainlinkInvalidEvent()`.
+Implemented in: `EventTypes.cs`, `EventSubjects.cs` (Task 92). Tests: `OcspEventTests.cs`.
 
 ---
 
@@ -665,29 +680,29 @@ Event types defined but payloads may be incomplete (server info, client info fie
 
 `ProcessImplicitGateway(GatewayInfo)` with URL deduplication, `DiscoveredGateways` property. New `GatewayInfo` record type. Tests: `ImplicitDiscoveryTests.cs`.
 
-### 11.2 Gateway Reconnection with Backoff (MEDIUM)
+### 11.2 Gateway Reconnection with Backoff — IMPLEMENTED
 
-**Missing**: `solicitGateways()`, `reconnectGateway()`, `solicitGateway()` with structured delay/jitter.
+Implemented in: `GatewayManager.cs` (Task 55). Tests: `GatewayReconnectionTests.cs`.
 
-### 11.3 Account-Specific Gateway Routes (MEDIUM)
+### 11.3 Account-Specific Gateway Routes — IMPLEMENTED
 
-**Missing**: `sendAccountSubsToGateway()` — routes all subscriptions without per-account isolation.
+Implemented in: `GatewayConnection.cs` (Task 56). Tests: `AccountGatewayRoutesTests.cs`.
 
-### 11.4 Queue Group Propagation (MEDIUM)
+### 11.4 Queue Group Propagation — IMPLEMENTED
 
-**Missing**: `sendQueueSubsToGateway()` — queue-based load balancing may not work across gateways.
+Implemented in: `GatewayConnection.cs` (Task 57). Tests: `QueueGroupPropagationTests.cs`.
 
-### 11.5 Reply Subject Mapping Cache (MEDIUM)
+### 11.5 Reply Subject Mapping Cache — IMPLEMENTED
 
-**Missing**: `trackGWReply()`, `startGWReplyMapExpiration()` — dynamic reply tracking with TTL. Basic `_GR_` prefix exists but no caching.
+Implemented in: `ReplyMapper.cs` (Task 58). Tests: `ReplyMapCacheTests.cs`.
 
-### 11.6 Gateway Command Protocol (LOW)
+### 11.6 Gateway Command Protocol — IMPLEMENTED
 
-**Missing**: `gatewayCmdGossip`, `gatewayCmdAllSubsStart`, `gatewayCmdAllSubsComplete` — no bulk subscription synchronization.
+Implemented in: `GatewayCommands.cs` (Task 59). Tests: `GatewayCommandTests.cs`.
 
-### 11.7 Connection Registration (LOW)
+### 11.7 Connection Registration — IMPLEMENTED
 
-**Missing**: `registerInboundGatewayConnection()`, `registerOutboundGatewayConnection()`, `getRemoteGateway()` — minimal gateway registry.
+Implemented in: `GatewayManager.cs` (Task 60). Tests: `GatewayRegistrationTests.cs`.
 
 ---
 
@@ -698,33 +713,33 @@ Event types defined but payloads may be incomplete (server info, client info fie
 **Current .NET total**: ~768 lines
 **Gap factor**: 4.5x
 
-### 12.1 TLS Certificate Hot-Reload (MEDIUM)
+### 12.1 TLS Certificate Hot-Reload — IMPLEMENTED
 
-**Missing**: `updateRemoteLeafNodesTLSConfig()` — TLS cert changes require server restart.
+Implemented in: `LeafNodeManager.cs` (Task 66). Tests: `LeafTlsReloadTests.cs`.
 
-### 12.2 Permission & Account Syncing (MEDIUM)
+### 12.2 Permission & Account Syncing — IMPLEMENTED
 
-**Missing**: `sendPermsAndAccountInfo()`, `initLeafNodeSmapAndSendSubs()` — permission changes on hub may not propagate.
+Implemented in: `LeafNodeManager.cs`, `LeafConnection.cs` (Task 67). Tests: `LeafPermissionSyncTests.cs`.
 
-### 12.3 Leaf Connection State Validation (MEDIUM)
+### 12.3 Leaf Connection State Validation — IMPLEMENTED
 
-**Missing**: `remoteLeafNodeStillValid()` — no validation of remote config on reconnect.
+Implemented in: `LeafNodeManager.cs` (Task 68). Tests: `LeafValidationTests.cs`.
 
-### 12.4 JetStream Migration Checks (LOW)
+### 12.4 JetStream Migration Checks — IMPLEMENTED
 
-**Missing**: `checkJetStreamMigrate()` — cannot safely migrate leaf JetStream domains.
+Implemented in: `LeafNodeManager.cs` (Task 69). Tests: `LeafJetStreamMigrationTests.cs`.
 
-### 12.5 Leaf Node WebSocket Support (LOW)
+### 12.5 Leaf Node WebSocket Support — IMPLEMENTED
 
-**Missing**: Go accepts WebSocket connections for leaf nodes.
+Implemented in: `WebSocketStreamAdapter.cs` (Task 70). Tests: `LeafWebSocketTests.cs`.
 
-### 12.6 Leaf Cluster Registration (LOW)
+### 12.6 Leaf Cluster Registration — IMPLEMENTED
 
-**Missing**: `registerLeafNodeCluster()`, `hasLeafNodeCluster()` — cannot query leaf topology.
+Implemented in: `LeafNodeManager.cs` (Task 71). Tests: `LeafClusterRegistrationTests.cs`.
 
-### 12.7 Connection Disable Flag (LOW)
+### 12.7 Connection Disable Flag — IMPLEMENTED
 
-**Missing**: `isLeafConnectDisabled()` — cannot selectively disable leaf solicitation.
+Implemented in: `LeafNodeManager.cs` (Task 72). Tests: `LeafDisableTests.cs`.
 
 ---
 
@@ -741,25 +756,25 @@ Event types defined but payloads may be incomplete (server info, client info fie
 
 `ProcessImplicitRoute(ServerInfo)`, `ForwardNewRouteInfoToKnownServers`, `AddKnownRoute`, `DiscoveredRoutes`, `OnForwardInfo` event. Added `ConnectUrls` to `ServerInfo`. Tests: `ImplicitDiscoveryTests.cs`.
 
-### 13.2 Account-Specific Dedicated Routes (MEDIUM)
+### 13.2 Account-Specific Dedicated Routes — IMPLEMENTED
 
-**Missing**: Per-account route pinning for traffic isolation.
+Implemented in: `RouteManager.cs` (Task 61). Tests: `AccountRouteTests.cs`.
 
-### 13.3 Route Pool Size Negotiation (MEDIUM)
+### 13.3 Route Pool Size Negotiation — IMPLEMENTED
 
-**Missing**: Handling heterogeneous clusters with different pool sizes.
+Implemented in: `RouteConnection.cs` (Task 62). Tests: `PoolSizeNegotiationTests.cs`.
 
-### 13.4 Route Hash Storage (LOW)
+### 13.4 Route Hash Storage — IMPLEMENTED
 
-**Missing**: `storeRouteByHash()`, `getRouteByHash()` for efficient route lookup.
+Implemented in: `RouteManager.cs` (Task 63). Tests: `RouteHashStorageTests.cs`.
 
-### 13.5 Cluster Split Handling (LOW)
+### 13.5 Cluster Split Handling — IMPLEMENTED
 
-**Missing**: `removeAllRoutesExcept()`, `removeRoute()` — no partition handling.
+Implemented in: `RouteManager.cs` (Task 64). Tests: `ClusterSplitTests.cs`.
 
-### 13.6 No-Pool Route Fallback (LOW)
+### 13.6 No-Pool Route Fallback — IMPLEMENTED
 
-**Missing**: Interoperability with older servers without pool support.
+Implemented in: `RouteManager.cs`, `RouteConnection.cs` (Task 65). Tests: `NoPoolFallbackTests.cs`.
 
 ---
 
@@ -776,25 +791,25 @@ Event types defined but payloads may be incomplete (server info, client info fie
 
 `SignalHandler` static class with `PosixSignalRegistration` for SIGHUP. `ConfigReloader.ReloadFromOptionsAsync` with `ReloadFromOptionsResult` (success/rejected changes). Tests: `SignalHandlerTests.cs`.
 
-### 14.2 Auth Change Propagation (MEDIUM)
+### 14.2 Auth Change Propagation — IMPLEMENTED
 
-**Missing**: When users/nkeys change, propagate to existing connections.
+Implemented in: `ConfigReloader.cs` (Task 50). Tests: `AuthChangePropagationTests.cs`.
 
-### 14.3 TLS Certificate Reload (MEDIUM)
+### 14.3 TLS Certificate Reload — IMPLEMENTED
 
-**Missing**: Reload certificates for new connections without restart.
+Implemented in: `ConfigReloader.cs` (Task 51). Tests: `TlsReloadTests.cs`.
 
-### 14.4 Cluster Config Hot Reload (MEDIUM)
+### 14.4 Cluster Config Hot Reload — IMPLEMENTED
 
-**Missing**: Add/remove route URLs, gateway URLs, leaf node URLs at runtime.
+Implemented in: `ConfigReloader.cs` (Task 52). Tests: `ClusterConfigReloadTests.cs`.
 
-### 14.5 Logging Level Changes (LOW)
+### 14.5 Logging Level Changes — IMPLEMENTED
 
-**Missing**: Debug/trace/logtime changes at runtime.
+Implemented in: `ConfigReloader.cs` (Task 53). Tests: `LoggingReloadTests.cs`.
 
-### 14.6 JetStream Config Changes (LOW)
+### 14.6 JetStream Config Changes — IMPLEMENTED
 
-**Missing**: JetStream option reload.
+Implemented in: `ConfigReloader.cs` (Task 54). Tests: `JetStreamConfigReloadTests.cs`.
 
 ---
 
@@ -806,9 +821,9 @@ Event types defined but payloads may be incomplete (server info, client info fie
 
 WebSocket support is the most complete subsystem. Compression negotiation (permessage-deflate), JWT auth through WebSocket, and origin checking are all implemented.
 
-### 15.1 WebSocket-Specific TLS (LOW)
+### 15.1 WebSocket-Specific TLS — IMPLEMENTED
 
-Minor TLS configuration differences.
+Implemented in: `WebSocketTlsConfig.cs` (Task 93). Tests: `WebSocketTlsTests.cs`.
 
 ---
 
@@ -846,13 +861,13 @@ Additional Tier 2 items implemented:
 - ~~**Cluster leadership transition** (Gap 2.5)~~ — IMPLEMENTED (Task 13)
 - ~~**Cluster snapshot recovery** (Gap 2.6)~~ — IMPLEMENTED (Task 9)
 
-### Tier 3: Important Features (MEDIUM)
+### Tier 3: Important Features (MEDIUM) — ALL IMPLEMENTED
 
-16–40: Account management, monitoring, gateway details, leaf node features, consumer advanced features, etc.
+16–40: Account management, monitoring, gateway details, leaf node features, consumer advanced features, etc. All implemented across Tasks 50–92.
 
-### Tier 4: Nice-to-Have (LOW)
+### Tier 4: Nice-to-Have (LOW) — ALL IMPLEMENTED
 
-41+: Internal client kinds, election jitter, event compression, etc.
+41+: Internal client kinds, election jitter, event compression, etc. All implemented across Tasks 50–93.
 
 ---