chore: organize solution into module folders (Core/Server/Drivers/Client/Tooling)

Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.

- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
  the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
  mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
  integration, install).

Build green (0 errors); unit tests pass. Docs left for a separate pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests/AbServerFixture.cs

@@ -0,0 +1,116 @@
+using System.Net.Sockets;
+using Xunit;
+using Xunit.Sdk;
+
+namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.IntegrationTests;
+
+/// <summary>
+///     Reachability probe for the <c>ab_server</c> Docker container (libplctag's CIP
+///     simulator built via <c>Docker/Dockerfile</c>) or any real AB PLC the
+///     <c>AB_SERVER_ENDPOINT</c> env var points at. Parses
+///     <c>AB_SERVER_ENDPOINT</c> (default <c>localhost:44818</c>) + TCP-connects
+///     once at fixture construction. Tests skip via <see cref="AbServerFactAttribute"/>
+///     / <see cref="AbServerTheoryAttribute"/> when the port isn't live, so
+///     <c>dotnet test</c> stays green on a fresh clone without Docker running.
+///     Matches the <see cref="ModbusSimulatorFixture"/> / <c>Snap7ServerFixture</c> /
+///     <c>OpcPlcFixture</c> shape.
+/// </summary>
+/// <remarks>
+///     Docker is the only supported launch path — no native-binary spawn + no
+///     PATH lookup. Bring the container up before <c>dotnet test</c>:
+///     <c>docker compose -f Docker/docker-compose.yml --profile controllogix up</c>.
+/// </remarks>
+public sealed class AbServerFixture : IAsyncLifetime
+{
+    private const string EndpointEnvVar = "AB_SERVER_ENDPOINT";
+
+    /// <summary>The profile this fixture instance represents. Parallel family smoke tests
+    /// instantiate the fixture with the profile matching their compose-file service.</summary>
+    public AbServerProfile Profile { get; }
+
+    public string Host { get; } = "127.0.0.1";
+    public int Port { get; } = AbServerProfile.DefaultPort;
+
+    public AbServerFixture() : this(KnownProfiles.ControlLogix) { }
+
+    public AbServerFixture(AbServerProfile profile)
+    {
+        Profile = profile ?? throw new ArgumentNullException(nameof(profile));
+
+        // Endpoint override applies to both host + port — targeting a real PLC at
+        // non-default host or port shouldn't need fixture changes.
+        if (Environment.GetEnvironmentVariable(EndpointEnvVar) is { Length: > 0 } raw)
+        {
+            var parts = raw.Split(':', 2);
+            Host = parts[0];
+            if (parts.Length == 2 && int.TryParse(parts[1], out var p)) Port = p;
+        }
+    }
+
+    public ValueTask InitializeAsync() => ValueTask.CompletedTask;
+    public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+
+    /// <summary>
+    ///     <c>true</c> when ab_server is reachable at this fixture's Host/Port. Used by
+    ///     <see cref="AbServerFactAttribute"/> / <see cref="AbServerTheoryAttribute"/>
+    ///     to decide whether to skip tests on a fresh clone without a running container.
+    /// </summary>
+    public static bool IsServerAvailable() =>
+        TcpProbe(ResolveHost(), ResolvePort());
+
+    private static string ResolveHost() =>
+        Environment.GetEnvironmentVariable(EndpointEnvVar)?.Split(':', 2)[0] ?? "127.0.0.1";
+
+    private static int ResolvePort()
+    {
+        var raw = Environment.GetEnvironmentVariable(EndpointEnvVar);
+        if (raw is null) return AbServerProfile.DefaultPort;
+        var parts = raw.Split(':', 2);
+        return parts.Length == 2 && int.TryParse(parts[1], out var p) ? p : AbServerProfile.DefaultPort;
+    }
+
+    /// <summary>One-shot TCP probe; 500 ms budget so a missing container fails the probe fast.</summary>
+    private static bool TcpProbe(string host, int port)
+    {
+        try
+        {
+            using var client = new TcpClient();
+            var task = client.ConnectAsync(host, port);
+            return task.Wait(TimeSpan.FromMilliseconds(500)) && client.Connected;
+        }
+        catch { return false; }
+    }
+}
+
+/// <summary>
+///     <c>[Fact]</c>-equivalent that skips when ab_server isn't reachable — accepts a
+///     live Docker listener on <c>localhost:44818</c> or an <c>AB_SERVER_ENDPOINT</c>
+///     override pointing at a real PLC.
+/// </summary>
+public sealed class AbServerFactAttribute : FactAttribute
+{
+    public AbServerFactAttribute()
+    {
+        if (!AbServerFixture.IsServerAvailable())
+            Skip = "ab_server not reachable. Start the Docker container " +
+                   "(docker compose -f Docker/docker-compose.yml --profile controllogix up) " +
+                   "or set AB_SERVER_ENDPOINT to a real PLC.";
+    }
+}
+
+/// <summary>
+///     <c>[Theory]</c>-equivalent with the same availability rules as
+///     <see cref="AbServerFactAttribute"/>. Pair with
+///     <c>[MemberData(nameof(KnownProfiles.All))]</c>-style providers to run one theory
+///     row per family.
+/// </summary>
+public sealed class AbServerTheoryAttribute : TheoryAttribute
+{
+    public AbServerTheoryAttribute()
+    {
+        if (!AbServerFixture.IsServerAvailable())
+            Skip = "ab_server not reachable. Start the Docker container " +
+                   "(docker compose -f Docker/docker-compose.yml --profile controllogix up) " +
+                   "or set AB_SERVER_ENDPOINT to a real PLC.";
+    }
+}