# Phase 6: Initial Porting Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers-extended-cc:executing-plans to implement this plan task-by-task.

**Goal:** Port all 3632 Go features and 3257 tests across 12 modules from the Go NATS server to idiomatic .NET 10 C#, working bottom-up through the dependency graph.

**Architecture:** Port leaf modules (11 small modules, 279 features total) in parallel first, then tackle the server module (3394 features) in functional batches. The `dependency ready` command drives porting order. Every feature gets a stub before implementation; tests are ported alongside.

**Tech Stack:** .NET 10, C# latest, xUnit 3, Shouldly, NSubstitute, Microsoft.Extensions.Logging, Serilog, System.IO.Pipelines, BCrypt.Net-Next, IronSnappy, Tpm2Lib

---

## Dependency Graph Summary

```
Leaf modules (all unblocked — port in parallel):
  ats      module 1   4 features,   3 tests  → AccessTimeService
  avl      module 2  36 features,  16 tests  → SequenceSet (AVL tree)
  certidp  module 3  14 features,   2 tests  → CertificateIdentityProvider
  certstore module 4 36 features,   0 tests  → CertificateStore
  elastic  module 5   5 features,   0 tests  → ElasticEncoding
  gsl      module 6  26 features,  21 tests  → GenericSubjectList
  pse      module 7  28 features,   3 tests  → ProcessStatsProvider
  stree    module 9 101 features,  59 tests  → SubjectTree
  sysmem   module 10  9 features,   0 tests  → SystemMemory
  thw      module 11 12 features,  14 tests  → TimeHashWheel
  tpm      module 12  8 features,   2 tests  → TpmKeyProvider

Server module (blocked on all leaf modules):
  server   module 8  3394 features, ~3137 tests → NatsServer (347K Go LOC)
```

---

## TDD Porting Pattern (repeat for every feature)

1. `dotnet run --project tools/NatsNet.PortTracker -- feature update <id> --status stub --db porting.db`
2. Write failing test (translate Go test, Shouldly assertions, xUnit `[Fact]`/`[Theory]`)
3. Run test: confirm FAIL
4. Implement feature: idiomatic C# from Go source (coordinates in `feature show <id>`)
5. Run test: confirm PASS
6. `dotnet run --project tools/NatsNet.PortTracker -- feature update <id> --status complete --db porting.db`

After all features in a module: `dotnet run --project tools/NatsNet.PortTracker -- module update <id> --status complete --db porting.db`

---

## Go→.NET Translation Reference

| Go pattern | .NET equivalent |
|-----------|-----------------|
| `goroutine` + `channel` | `Task` + `Channel<T>` or `async/await` |
| `sync.Mutex` | `lock` or `SemaphoreSlim` |
| `sync.RWMutex` | `ReaderWriterLockSlim` |
| `sync.WaitGroup` | `Task.WhenAll` or `CountdownEvent` |
| `defer` | `try/finally` or `using` |
| `interface{}` / `any` | `object` or generics |
| `[]byte` | `byte[]`, `ReadOnlySpan<byte>`, or `ReadOnlyMemory<byte>` |
| `map[K]V` | `Dictionary<K,V>` or `ConcurrentDictionary<K,V>` |
| `error` return | Exceptions or `Result<T>` |
| `panic/recover` | Exceptions |
| `select` on channels | `Task.WhenAny` or `Channel<T>` reader |
| `context.Context` | `CancellationToken` |
| `io.Reader/Writer` | `Stream`, `PipeReader/PipeWriter` |
| `init()` | Static constructor or DI registration |

---

## Task 0: Create .NET Solution Structure

**Files to create:**
- `dotnet/ZB.MOM.NatsNet.sln`
- `dotnet/src/ZB.MOM.NatsNet.Server/ZB.MOM.NatsNet.Server.csproj`
- `dotnet/src/ZB.MOM.NatsNet.Server.Host/ZB.MOM.NatsNet.Server.Host.csproj`
- `dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ZB.MOM.NatsNet.Server.Tests.csproj`
- `dotnet/tests/ZB.MOM.NatsNet.Server.IntegrationTests/ZB.MOM.NatsNet.Server.IntegrationTests.csproj`

**Step 1: Scaffold projects**

```bash
cd /Users/dohertj2/Desktop/natsnet/dotnet
dotnet new sln -n ZB.MOM.NatsNet
dotnet new classlib -n ZB.MOM.NatsNet.Server -o src/ZB.MOM.NatsNet.Server --framework net10.0
dotnet new console -n ZB.MOM.NatsNet.Server.Host -o src/ZB.MOM.NatsNet.Server.Host --framework net10.0
dotnet new xunit -n ZB.MOM.NatsNet.Server.Tests -o tests/ZB.MOM.NatsNet.Server.Tests --framework net10.0
dotnet new xunit -n ZB.MOM.NatsNet.Server.IntegrationTests -o tests/ZB.MOM.NatsNet.Server.IntegrationTests --framework net10.0
dotnet sln add src/ZB.MOM.NatsNet.Server/ZB.MOM.NatsNet.Server.csproj
dotnet sln add src/ZB.MOM.NatsNet.Server.Host/ZB.MOM.NatsNet.Server.Host.csproj
dotnet sln add tests/ZB.MOM.NatsNet.Server.Tests/ZB.MOM.NatsNet.Server.Tests.csproj
dotnet sln add tests/ZB.MOM.NatsNet.Server.IntegrationTests/ZB.MOM.NatsNet.Server.IntegrationTests.csproj
```

**Step 2: Configure server library .csproj**

Replace contents of `dotnet/src/ZB.MOM.NatsNet.Server/ZB.MOM.NatsNet.Server.csproj`:

```xml
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <LangVersion>latest</LangVersion>
    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="*" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="*" />
    <PackageReference Include="System.IO.Pipelines" Version="*" />
    <PackageReference Include="BCrypt.Net-Next" Version="*" />
    <PackageReference Include="IronSnappy" Version="*" />
  </ItemGroup>
</Project>
```

Note: Tpm2Lib is Windows-only; add it in Task 11 for the tpm module with a conditional reference.

**Step 3: Configure Host .csproj**

Replace contents of `dotnet/src/ZB.MOM.NatsNet.Server.Host/ZB.MOM.NatsNet.Server.Host.csproj`:

```xml
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <LangVersion>latest</LangVersion>
  </PropertyGroup>
  <ItemGroup>
    <ProjectReference Include="../ZB.MOM.NatsNet.Server/ZB.MOM.NatsNet.Server.csproj" />
    <PackageReference Include="Microsoft.Extensions.Hosting" Version="*" />
    <PackageReference Include="Serilog" Version="*" />
    <PackageReference Include="Serilog.Extensions.Hosting" Version="*" />
    <PackageReference Include="Serilog.Sinks.Console" Version="*" />
  </ItemGroup>
</Project>
```

**Step 4: Configure Tests .csproj**

Replace contents of `dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ZB.MOM.NatsNet.Server.Tests.csproj`:

```xml
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <LangVersion>latest</LangVersion>
    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
    <ProjectReference Include="../../src/ZB.MOM.NatsNet.Server/ZB.MOM.NatsNet.Server.csproj" />
    <PackageReference Include="xunit" Version="3.*" />
    <PackageReference Include="xunit.runner.visualstudio" Version="3.*" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="*" />
    <PackageReference Include="Shouldly" Version="*" />
    <PackageReference Include="NSubstitute" Version="*" />
    <PackageReference Include="BenchmarkDotNet" Version="*" />
  </ItemGroup>
</Project>
```

Apply the same to `dotnet/tests/ZB.MOM.NatsNet.Server.IntegrationTests/ZB.MOM.NatsNet.Server.IntegrationTests.csproj`.

**Step 5: Clean boilerplate, add placeholder Program.cs, verify build**

```bash
rm -f dotnet/src/ZB.MOM.NatsNet.Server/Class1.cs
# Program.cs for Host (placeholder)
# Write: Console.WriteLine("ZB.MOM.NatsNet.Server"); to Program.cs
dotnet build /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
dotnet test /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
```

Expected: build succeeds, 0 tests (or default xUnit tests pass).

**Step 6: Commit**

```bash
git add dotnet/
git commit -m "chore: scaffold .NET solution structure for Phase 6"
```

---

## Task 1: Port `avl` Module — SequenceSet

**Go source:** `golang/nats-server/server/avl/seqset.go` (678 LOC)
**Go tests:** `golang/nats-server/server/avl/seqset_test.go`, `norace_test.go`
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/DataStructures/SequenceSet.cs`
**Tests:** `dotnet/tests/ZB.MOM.NatsNet.Server.Tests/Internal/DataStructures/SequenceSetTests.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal.DataStructures`
**Features:** 36 (IDs 5–40) | **Tests:** 16 | **Module ID:** 2

**Step 1: Mark all stubs**

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 2 --db porting.db
```

**Step 2: Lookup source coordinates for key features**

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature show 5 --db porting.db   # Insert (line 44)
dotnet run --project tools/NatsNet.PortTracker -- feature show 6 --db porting.db   # Exists
dotnet run --project tools/NatsNet.PortTracker -- feature show 8 --db porting.db   # Delete
dotnet run --project tools/NatsNet.PortTracker -- feature show 22 --db porting.db  # Encode
dotnet run --project tools/NatsNet.PortTracker -- feature show 23 --db porting.db  # Decode
```

**Step 3: Create the class skeleton**

Create `dotnet/src/ZB.MOM.NatsNet.Server/Internal/DataStructures/SequenceSet.cs`.

Key type mappings:
- `SequenceSet` struct → `public sealed class SequenceSet`
- `node` struct → `private sealed class Node`
- Go `uint64` → C# `ulong`
- Go pointer receivers on `node` → C# methods on `Node`

All methods: `throw new NotImplementedException()` initially.

**Step 4: Write failing tests**

Create `SequenceSetTests.cs` translating from `seqset_test.go`. Example:

```csharp
// Go: TestSeqSetBasics
[Fact]
public void SeqSetBasics_ShouldSucceed()
{
    var ss = new SequenceSet();
    ss.IsEmpty().ShouldBeTrue();
    ss.Insert(1);
    ss.Exists(1).ShouldBeTrue();
    ss.Exists(2).ShouldBeFalse();
    ss.Size().ShouldBe(1);
    ss.Delete(1);
    ss.IsEmpty().ShouldBeTrue();
}
```

Run: `dotnet test dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ --filter "FullyQualifiedName~SequenceSetTests"`
Expected: FAIL with NotImplementedException.

**Step 5: Implement SequenceSet**

Port AVL tree logic from `seqset.go`. Critical Go→.NET:
- `uint64` → `ulong`
- nil checks → null checks
- `Range(f func(uint64, uint64) bool)` → `Range(Func<ulong, ulong, bool> f)`
- Encode/Decode using `ReadOnlySpan<byte>` and `BinaryPrimitives`

**Step 6: Run tests**

```bash
dotnet test dotnet/tests/ZB.MOM.NatsNet.Server.Tests/ --filter "FullyQualifiedName~SequenceSetTests"
```

Expected: all 16 tests pass.

**Step 7: Update DB**

```bash
for id in 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40; do
  dotnet run --project tools/NatsNet.PortTracker -- feature update $id --status complete --db porting.db
done
dotnet run --project tools/NatsNet.PortTracker -- test list --module 2 --db porting.db
# mark each test complete
dotnet run --project tools/NatsNet.PortTracker -- module update 2 --status complete --db porting.db
```

**Step 8: Commit**

```bash
git add dotnet/
git commit -m "feat: port avl module - SequenceSet AVL tree"
```

---

## Task 2: Port `ats` Module — AccessTimeService

**Go source:** `golang/nats-server/server/ats/ats.go` (186 LOC)
**Go tests:** `golang/nats-server/server/ats/ats_test.go`
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/AccessTimeService.cs`
**Tests:** `dotnet/tests/ZB.MOM.NatsNet.Server.Tests/Internal/AccessTimeServiceTests.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal`
**Features:** IDs 1–4 | **Tests:** IDs 1–3 | **Module ID:** 1

Tracks access times; `init()` → static initialization. Follow TDD pattern.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 1 --db porting.db
# implement Register, Unregister, AccessTime, Init
for id in 1 2 3 4; do dotnet run --project tools/NatsNet.PortTracker -- feature update $id --status complete --db porting.db; done
dotnet run --project tools/NatsNet.PortTracker -- module update 1 --status complete --db porting.db
git commit -m "feat: port ats module - AccessTimeService"
```

---

## Task 3: Port `elastic` Module — ElasticEncoding

**Go source:** `golang/nats-server/server/elastic/elastic.go` (61 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/ElasticEncoding.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal`
**Features:** 5 | **Tests:** 0 | **Module ID:** 5

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 5 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- feature list --module 5 --db porting.db
# implement features; no tests to port
dotnet run --project tools/NatsNet.PortTracker -- module update 5 --status complete --db porting.db
git commit -m "feat: port elastic module - ElasticEncoding"
```

---

## Task 4: Port `sysmem` Module — SystemMemory

**Go source:** `golang/nats-server/server/sysmem/mem_*.go` (platform-specific)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/SystemMemory.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal`
**Features:** 9 | **Tests:** 0 | **Module ID:** 10

Use `System.Diagnostics.Process` and `GC.GetTotalMemory` for cross-platform memory. Mark platform-specific Go variants (BSD, Solaris, WASM, z/OS) as N/A with reason.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 10 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- feature list --module 10 --db porting.db
# implement; mark n/a for platform variants
dotnet run --project tools/NatsNet.PortTracker -- module update 10 --status complete --db porting.db
git commit -m "feat: port sysmem module - SystemMemory"
```

---

## Task 5: Port `thw` Module — TimeHashWheel

**Go source:** `golang/nats-server/server/thw/` (656 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/TimeHashWheel.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal`
**Features:** 12 | **Tests:** 14 | **Module ID:** 11

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 11 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- test list --module 11 --db porting.db
# TDD: write tests first, then implement hash wheel
dotnet run --project tools/NatsNet.PortTracker -- module update 11 --status complete --db porting.db
git commit -m "feat: port thw module - TimeHashWheel"
```

---

## Task 6: Port `certidp` Module — CertificateIdentityProvider

**Go source:** `golang/nats-server/server/certidp/` (600 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Auth/CertificateIdentityProvider.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Auth`
**Features:** 14 | **Tests:** 2 | **Module ID:** 3

Use `System.Security.Cryptography.X509Certificates`.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 3 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- module update 3 --status complete --db porting.db
git commit -m "feat: port certidp module - CertificateIdentityProvider"
```

---

## Task 7: Port `certstore` Module — CertificateStore

**Go source:** `golang/nats-server/server/certstore/` (1197 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Auth/CertificateStore.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Auth`
**Features:** 36 | **Tests:** 0 | **Module ID:** 4

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 4 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- module update 4 --status complete --db porting.db
git commit -m "feat: port certstore module - CertificateStore"
```

---

## Task 8: Port `gsl` Module — GenericSubjectList

**Go source:** `golang/nats-server/server/gsl/` (936 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Subscriptions/GenericSubjectList.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Subscriptions`
**Features:** 26 | **Tests:** 21 | **Module ID:** 6

Performance-sensitive. Use `ReadOnlySpan<byte>` for subject matching.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 6 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- test list --module 6 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- module update 6 --status complete --db porting.db
git commit -m "feat: port gsl module - GenericSubjectList"
```

---

## Task 9: Port `pse` Module — ProcessStatsProvider

**Go source:** `golang/nats-server/server/pse/` (1150 LOC, platform-specific)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Internal/ProcessStatsProvider.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Internal`
**Features:** 28 | **Tests:** 3 | **Module ID:** 7

Use `System.Diagnostics.Process`. Mark Go-specific syscall wrappers N/A where replaced.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 7 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- module update 7 --status complete --db porting.db
git commit -m "feat: port pse module - ProcessStatsProvider"
```

---

## Task 10: Port `stree` Module — SubjectTree

**Go source:** `golang/nats-server/server/stree/` (3628 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Subscriptions/SubjectTree.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Subscriptions`
**Features:** 101 | **Tests:** 59 | **Module ID:** 9

Largest leaf module. Performance-critical NATS routing trie. Use `ReadOnlySpan<byte>` throughout.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 9 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- test list --module 9 --db porting.db
# write 59 tests first, implement trie, iterate until all pass
dotnet run --project tools/NatsNet.PortTracker -- module update 9 --status complete --db porting.db
git commit -m "feat: port stree module - SubjectTree"
```

---

## Task 11: Port `tpm` Module — TpmKeyProvider

**Go source:** `golang/nats-server/server/tpm/` (387 LOC)
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/Auth/TpmKeyProvider.cs`
**Namespace:** `ZB.MOM.NatsNet.Server.Auth`
**Features:** 8 | **Tests:** 2 | **Module ID:** 12

Add conditional Tpm2Lib reference (Windows-only). If unavailable on current platform, throw `PlatformNotSupportedException`.

```bash
dotnet run --project tools/NatsNet.PortTracker -- feature update 0 --status stub --all-in-module 12 --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- module update 12 --status complete --db porting.db
git commit -m "feat: port tpm module - TpmKeyProvider"
```

---

## Task 12: Verify Wave 1 (All Leaf Modules Complete)

```bash
dotnet run --project tools/NatsNet.PortTracker -- report summary --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- dependency ready --db porting.db | head -5
dotnet build /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
dotnet test /Users/dohertj2/Desktop/natsnet/dotnet/tests/ZB.MOM.NatsNet.Server.Tests/
```

Expected: 11 modules complete, server module appears in `dependency ready`, build green.

---

## Task 13: Port Server Module — Batch A: Core Types

**Go sources:** `server/const.go`, `server/errors.go`, `server/errors_gen.go`, `server/proto.go`, `server/util.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Constants.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/NatsErrors.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Protocol/ProtocolConstants.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Internal/Utilities.cs`

```bash
dotnet run --project tools/NatsNet.PortTracker -- dependency ready --db porting.db
# identify IDs for const/errors/proto/util features; stub them
dotnet build /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
git commit -m "feat: port server core types (const, errors, proto, util)"
```

---

## Task 14: Port Server Module — Batch B: Options & Config

**Go sources:** `server/opts.go`, `server/reload.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Configuration/NatsServerOptions.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Configuration/NatsServerReload.cs`

```bash
git commit -m "feat: port server options and reload configuration"
```

---

## Task 15: Port Server Module — Batch C: Parser & Protocol

**Go sources:** `server/parser.go`, `server/ring.go`, `server/rate_counter.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Protocol/NatsParser.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Internal/RingBuffer.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Internal/RateCounter.cs`

Parser is performance-critical. Use `ReadOnlySpan<byte>` and `System.IO.Pipelines`.

```bash
git commit -m "feat: port server parser, ring buffer, rate counter"
```

---

## Task 16: Port Server Module — Batch D: Client & Connection

**Go sources:** `server/client.go`, `server/client_proxyproto.go`, `server/sendq.go`, `server/ipqueue.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Connections/NatsClient.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Connections/ProxyProtocolHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Connections/SendQueue.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Internal/IpQueue.cs`

Use `Channel<T>` for send queue. All async I/O via `PipeWriter`/`PipeReader`.

```bash
git commit -m "feat: port server client, connection, send queue"
```

---

## Task 17: Port Server Module — Batch E: Auth & Security

**Go sources:** `server/auth.go`, `server/auth_callout.go`, `server/jwt.go`, `server/nkey.go`, `server/ciphersuites.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/AuthHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/AuthCallout.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/JwtValidator.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/NkeyProvider.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/CipherSuiteMapper.cs`

```bash
git commit -m "feat: port server auth, JWT, nkeys, cipher suites"
```

---

## Task 18: Port Server Module — Batch F: Accounts & Events

**Go sources:** `server/accounts.go`, `server/events.go`, `server/dirstore.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/AccountManager.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Events/NatsEventBus.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/DirectoryAccountStore.cs`

```bash
git commit -m "feat: port server accounts, events, directory store"
```

---

## Task 19: Port Server Module — Batch G: Sublist & Subject Transform

**Go sources:** `server/sublist.go`, `server/subject_transform.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Subscriptions/SubList.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Subscriptions/SubjectTransform.cs`

Hot path. Use `ReadOnlySpan<byte>`, avoid allocations in `Match`.

```bash
git commit -m "feat: port server sublist and subject transform"
```

---

## Task 20: Port Server Module — Batch H: Clustering

**Go sources:** `server/route.go`, `server/gateway.go`, `server/leafnode.go`, `server/raft.go`, `server/sdm.go`, `server/scheduler.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/RouteHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/GatewayHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/LeafNodeHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/RaftConsensus.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/StreamDomainManager.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Cluster/Scheduler.cs`

```bash
git commit -m "feat: port server clustering (routes, gateway, leaf nodes, raft)"
```

---

## Task 21: Port Server Module — Batch I: JetStream Core

**Go sources:** `server/jetstream.go`, `server/jetstream_api.go`, `server/jetstream_errors.go`, `server/jetstream_errors_generated.go`, `server/jetstream_events.go`, `server/jetstream_versioning.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamEngine.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamApi.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamErrors.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamEvents.cs`

```bash
git commit -m "feat: port JetStream core engine and API"
```

---

## Task 22: Port Server Module — Batch J: JetStream Storage

**Go sources:** `server/store.go`, `server/filestore.go`, `server/memstore.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/Storage/IMessageStore.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/Storage/FileMessageStore.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/Storage/MemoryMessageStore.cs`

Define `IMessageStore` from `store.go` first, then implement.

```bash
git commit -m "feat: port JetStream storage (file store, memory store)"
```

---

## Task 23: Port Server Module — Batch K: JetStream Streams & Consumers

**Go sources:** `server/stream.go`, `server/consumer.go`, `server/jetstream_batching.go`, `server/jetstream_cluster.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/StreamManager.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/ConsumerManager.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/BatchProcessor.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/JetStream/JetStreamCluster.cs`

```bash
git commit -m "feat: port JetStream streams, consumers, batching, cluster"
```

---

## Task 24: Port Server Module — Batch L: Monitoring

**Go sources:** `server/monitor.go`, `server/monitor_sort_opts.go`, `server/msgtrace.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Monitoring/NatsMonitor.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Monitoring/MonitorSortOptions.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Monitoring/MessageTracer.cs`

`log.go` features → mark N/A: replaced by `Microsoft.Extensions.Logging` + Serilog.

```bash
git commit -m "feat: port server monitoring, message tracing (log.go → N/A)"
```

---

## Task 25: Port Server Module — Batch M: MQTT & WebSocket

**Go sources:** `server/mqtt.go`, `server/websocket.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Protocol/MqttHandler.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Protocol/WebSocketHandler.cs`

```bash
git commit -m "feat: port MQTT and WebSocket protocol handlers"
```

---

## Task 26: Port Server Module — Batch N: OCSP & TLS

**Go sources:** `server/ocsp.go`, `server/ocsp_peer.go`, `server/ocsp_responsecache.go`
**Targets:**
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/OcspValidator.cs`
- `dotnet/src/ZB.MOM.NatsNet.Server/Auth/OcspResponseCache.cs`

```bash
git commit -m "feat: port OCSP validation and response cache"
```

---

## Task 27: Port Server Module — Batch O: Platform-Specific & N/A

**Go sources:** `server/disk_avail_*.go`, `server/signal.go`, `server/signal_*.go`, `server/service.go`, `server/service_windows.go`

- Signal handling → mark N/A: replaced by `IHostApplicationLifetime`
- Windows service → port using `System.ServiceProcess`
- Disk availability → port using `System.IO.DriveInfo`; platform variants → N/A

```bash
git commit -m "feat: port platform-specific features, mark N/A where replaced"
```

---

## Task 28: Port Server Module — Batch P: Server Core

**Go source:** `server/server.go`
**Target:** `dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.cs`

Main `Server` struct and lifecycle. Final piece of the server module.

```bash
dotnet run --project tools/NatsNet.PortTracker -- module update 8 --status complete --db porting.db
git commit -m "feat: port server core lifecycle - server module complete"
```

---

## Task 29: Final Verification & Close Phase 6

```bash
dotnet build /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
dotnet test /Users/dohertj2/Desktop/natsnet/dotnet/ZB.MOM.NatsNet.sln
dotnet run --project tools/NatsNet.PortTracker -- dependency blocked --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- report summary --db porting.db
dotnet run --project tools/NatsNet.PortTracker -- phase check 6 --db porting.db

# Close Gitea issues 39-44
for issue in 39 40 41 42 43 44; do
  curl -s -X PATCH "https://gitea.dohertylan.com/api/v1/repos/dohertj2/natsnet/issues/$issue" \
    -H "Content-Type: application/json" \
    -H "Authorization: token $GITEA_TOKEN" \
    -d '{"state":"closed"}'
done

# Close Phase 6 milestone
curl -s -X PATCH "https://gitea.dohertylan.com/api/v1/repos/dohertj2/natsnet/milestones/6" \
  -H "Content-Type: application/json" \
  -H "Authorization: token $GITEA_TOKEN" \
  -d '{"state":"closed"}'

git commit -m "chore: complete phase 6 - initial porting complete"
```