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/Client/ZB.MOM.WW.OtOpcUa.Client.CLI.Tests/ConnectCommandTests.cs

@@ -0,0 +1,77 @@
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.OtOpcUa.Client.CLI.Commands;
+using ZB.MOM.WW.OtOpcUa.Client.CLI.Tests.Fakes;
+using ZB.MOM.WW.OtOpcUa.Client.Shared.Models;
+
+namespace ZB.MOM.WW.OtOpcUa.Client.CLI.Tests;
+
+public class ConnectCommandTests
+{
+    [Fact]
+    public async Task Execute_PrintsConnectionInfo()
+    {
+        var fakeService = new FakeOpcUaClientService
+        {
+            ConnectionInfoResult = new ConnectionInfo(
+                "opc.tcp://testhost:4840",
+                "MyServer",
+                "SignAndEncrypt",
+                "http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256",
+                "session-42",
+                "MySession")
+        };
+        var factory = new FakeOpcUaClientServiceFactory(fakeService);
+        var command = new ConnectCommand(factory)
+        {
+            Url = "opc.tcp://testhost:4840"
+        };
+
+        using var console = TestConsoleHelper.CreateConsole();
+        await command.ExecuteAsync(console);
+
+        var output = TestConsoleHelper.GetOutput(console);
+        output.ShouldContain("Connected to: opc.tcp://testhost:4840");
+        output.ShouldContain("Server: MyServer");
+        output.ShouldContain("Security Mode: SignAndEncrypt");
+        output.ShouldContain("Security Policy: http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256");
+        output.ShouldContain("Connection successful.");
+    }
+
+    [Fact]
+    public async Task Execute_CallsConnectAndDisconnect()
+    {
+        var fakeService = new FakeOpcUaClientService();
+        var factory = new FakeOpcUaClientServiceFactory(fakeService);
+        var command = new ConnectCommand(factory)
+        {
+            Url = "opc.tcp://localhost:4840"
+        };
+
+        using var console = TestConsoleHelper.CreateConsole();
+        await command.ExecuteAsync(console);
+
+        fakeService.ConnectCalled.ShouldBeTrue();
+        fakeService.DisconnectCalled.ShouldBeTrue();
+        fakeService.DisposeCalled.ShouldBeTrue();
+    }
+
+    [Fact]
+    public async Task Execute_DisconnectsOnError()
+    {
+        var fakeService = new FakeOpcUaClientService
+        {
+            ConnectException = new InvalidOperationException("Connection refused")
+        };
+        var factory = new FakeOpcUaClientServiceFactory(fakeService);
+        var command = new ConnectCommand(factory)
+        {
+            Url = "opc.tcp://localhost:4840"
+        };
+
+        using var console = TestConsoleHelper.CreateConsole();
+        // The command should propagate the exception but still clean up.
+        // Since connect fails, service is null in finally, so no disconnect.
+        await Should.ThrowAsync<InvalidOperationException>(async () => await command.ExecuteAsync(console));
+    }
+}